It's a neat piece of science art, and it also tells us something interesting. The arrows show us that the force on the skateboard is constantly changing, both in magnitude as well as in direction. Now the force of gravity obviously isn't changing, so the reason that these force arrows are shrinking and growing and tumbling around is that the skater is changing how their feet pushes and pulls against the board. By applying a variable force that changes both in strength and direction, they're steering the board.
The wheels of a skateboard are usually made of polyurethane, and come in many different sizes and shapes to suit different types of skating. Larger diameters (55–85 mm) roll faster, and move more easily over cracks in pavement and are better for transition skateboarding. Smaller diameters (48–54 mm) keep the board closer to the ground, require less force to accelerate and produce a lower center of gravity which allows for a better response time, but also make for a slower top speed and are better for street skateboarding. Wheels also are available in a variety of hardnesses usually measured on the Shore durometer "A" scale. Again like car tires, wheels range from the very soft (about Shore A 75) to the very hard (about Shore A 101). As the A scale stops at 100, any wheels labeled 101A or higher are harder, but do not use the appropriate durometer scale. Some wheel manufacturers now use the "B" or "D" scales, which have a larger and more accurate range of hardness. Modern street skaters prefer medium-sized wheels (usually 51–54 mm), as small wheels with lighter trucks can make tricks like kickflips and other flip tricks easier by keeping the center of gravity of the skateboard closer to the deck, thus making the deck easier to spin. Street wheels are harder (A 100/A 101). Vertical ramp or "vert" skating requires larger wheels (usually 55–65 mm), as it involves higher speeds. Vert wheels are also usually slightly softer (A 98/ A 99), allowing them to maintain high speed on ramps without sliding. Slalom skating requires even larger wheels (60–75 mm) to sustain the highest speeds possible. They also need to be soft and have better grip to make the tight and frequent turns in slalom racing. Even larger wheels are used in longboarding and downhill skateboarding. Sizes range from 65 mm to 100 mm. These extreme sizes of wheels almost always have cores of hard plastic that can be made thinner and lighter than a solid polyurethane wheel. They are often used by skateboard videographers as well, as the large soft wheels allow for smooth and easy movement over any terrain.
The switch stance ollie uses a similar body motion, but the nollie is subtly distinct: For one, the rider is always moving forward, with the body positioned in a nollie stance--closer to the nose and with the front foot on the nose. Secondly the rider usually postures the body differently so as to compensate for this stance with respect to the forward motion. The rider presses the nose down using their front foot to engage the "pop" motion in order for the board to rise. This is In contrast to a "Fakie Ollie" where the pop motion is performed by the rear foot on the tail, similarly to a normal Ollie, however the rider is traveling backwards when performing a Fakie Ollie. Where in a Nollie the rider is traveling forward with their front foot on the nose to apply the initial force "pop".
Land at the same time – Again, this is probably silly to repeat, but you’d be surprised to find out how many people execute a successful jump, and then throw their hands up in the air to celebrate their new-found triumph, and forget the most important part: landing. The best position for your feet to be in is as close to the trucks as possible. Don’t land too close to the nose or tail, or you could end up breaking off those the board itself. Also, remember to bend your knees to absorb the jump. Don’t want to land straight-legged: that’s how kneecaps are destroyed.
There are other types of ollies that you can do either alongside or combine with the ones listed above, like the tailgrab, indy grab, melon grab, stalefish, tweak, and dolphin nose. All of those skateboard tricks are performed more or less how they sound, but you might want to watch some videos on youtube to see a pro in action (as well as awesome cat videos).
In general an axle width should be chosen that is close to the width of the deck it will be used with.[8] For example, a 7.75" wide deck will usually be fitted with trucks that have axles between 7.5" wide and 8.0" wide. (Standard truck axle nut size is 5/16"-24tpi UNF, and the thinner "jam" style with an optional nylon lock.) Trucks that are too wide can make doing tricks difficult and can cause the wheels to get in the way when the skateboard is being ridden. Trucks that are too small can be hard to maintain stability and can cause wheel bite to occur when turning.
In the case that you didn't gave up after a hundred over tries, you'll start to develop a reaction to landing it. After a few hundred more tries, you'll feel you are getting off the ground and getting little air. And once you reach the thousandth try, you'll already be doing it whilst rolling and the next thousandth tries will be spent on clearing small cracks n obstacles and working towards ollieng up bigger obstacles n up ledges.

The Enjoi Whitey Panda deck features Resin 7 Construction. Resin 7 Construction uses 100% Canadian maple veneer with a specialized Epoxy resin Glue. These boards are individually pressed which helps insure you get the same concave and curvature in every deck - making your deck more consistent and your tricks more consistent. Why is it better? Compared to a traditional deck it's stronger and offers better pop and longer deck life. Core trucks are light weight and feature heavy duty aluminum with grade 8 steel kingpins and axles, as well as USA made bushings and pivot cups. 52mm 99A are the perfect wheels for both street and park skating. Like the name states, Amphetamine bearings are stimulants for your wheels! Light synthetic oil, Delrin Crowns, and Rubber Serviceable Shields are a few of the things that makes these bearings one of the best Abec 5 rated bearings on the market. Arrives un-assembled which allows for both customization and bonding time. Easy to assemble!
Ancheer 31″ Pro Skateboards are made of 7-ply maple wood and finished with anti-slip grip tape.  It includes 60mm PU wheels ideal for riders who want to carve out sections, obtain speed and higher off the ground for tricks. It features 6″ Tony Hawk Signature aluminum trucks and 32″ long deck with double kick tail which is ideal for perfecting your favorite tricks.  It comes with ABEC-7 skateboard bearings.  It has style and quality which is expected from the most influential skateboarders of all time.  It is one of the best-rated skateboards on Amazon with a rating of 4.8.
The Enjoi Whitey Panda deck features Resin 7 Construction. Resin 7 Construction uses 100% Canadian maple veneer with a specialized Epoxy resin Glue. These boards are individually pressed which helps insure you get the same concave and curvature in every deck - making your deck more consistent and your tricks more consistent. Why is it better? Compared to a traditional deck it's stronger and offers better pop and longer deck life.
To summarize, a skateboarder's feet need to do two things successfully to complete an ollie. They need to provide a changing force to move the board correctly (so that the combined force of gravity and the skater's feet add up to the green arrows above), and they need to provide different amounts of force with each foot (shown by the red and blue arrows above) to steer and turn the board into the right orientation.
The DAPANLA deck is 7.5-by-31-inches in size, on the smaller side of good quality, real skateboard decks, which makes it ideal for smaller and shorter people. Unlike many decks on the market today, the DAPANLA deck comes with non-slip grip tape on the top. The underside of the deck is similarly decorated, with a range of DAPANLA designs including the fun cartoon avocado board that is sure to turn a few heads for its uniqueness. 
The board is shaped like a cup in the center, and has whale tails on both ends, designed to make tricks easier to do. The blue stain on the board looks like the picture. It has a semi flat finish with no lacquer top coat. The underside is plain which allows the owner to add stickers and graphics if they want but they look great just the way they are.
The following descriptions cover skateboard parts that are most prevalent in popular and modern forms of skateboarding. Many parts exist with exotic or alternative constructions. A traditional complete skateboard consists of the deck (often with griptape applied on top to enhance traction), trucks (with urethane bushings), wheels (with sealed bearings), bushings, nuts and bolts to fasten the truck and wheel assembly to the bottom of the deck. Older decks also included plastic parts such as side, tail, and nose guards.

For sale I have a Powell peralta old school ripper complete red and black with 169mm independent blackout trucks blue cambria 3md 62mm wheels and bones reds bearings The deck has only been skated twice with minor scrapes on the tail and wheel wells I added the independent blackout 69mm trucks and the Cambria wheels im selling it because I’m moving in a different direction I’m building a longboard for myself for this summer anyway the deck is a reissue ripper you can’t get it anymore great overall skater very durable
In 1978, Alan Gelfand, who was given his nickname "Ollie" by Scott Goodman, learned to perform no-handed aerials in bowls and pools using a gentle raising of the nose and scooping motion to keep the board with the feet.[2][3] There are numerous references to Alan Gelfand's Ollie with most notably pictures in the 1970s skateboarding magazine "Skateboarder".
To get higher ollies, I would suggesting resting your back foot on the very end of the tail and the front foot in the middle of the deck to allow for more slide. Popping as hard as you can and catching your board in the groove of the nose with you ankle practically resting in the groove will level the board out in the air. after this initial movement slide you feet back to the bolts on the tail and nose to ensure a clean landing.