@Geekpride Thanks so much I understand it much more now!

Here's an explainer of the points system. You can see your points total in the box next to your name at the top of your screen, or when you make posts. The colour in that box changes when you hit a certain number of points:
101 for bronze
1,001 for silver
5,001 for gold
25,001 for platinum (well, it looks kind of black, but is called platinum)

As these represent milestones, a lot of people celebrate achieving them. The different ranks don't give you any direct benefits, but those with lots of points tend to be regarded as more skilled builders of planes.

The idea is that if someone likes a plane you've built, they'll click the upvote button, which rewards you with some points. My recommendations for getting points are:
1) Interesting, eye-catching planes. Something unusual to grab people's attention.
2) Highly detailed planes. It could be a replica, or it could be a fictional one you've put a lot of work into designing. If it looks good, and the effort is obvious, people tend to respond to that.
3) Challenges. There are usually a few challenges running that have been posted by other users. Competing in these at least means that someone will look at your plane, and a lot of them reward the winners with upvotes. Or make up your own challenge to post - those that want to take part will upvote it for appealing to them.
4) Race tournaments. Keep a lookout in the tournaments section, which is in the stuff menu. When a new tournament is open, build a plane to enter it. You get points if it wins races, and the best racers often get upvotes from other players as a sign of respect.

If you need any more help or advice, just make another forum post - we're quite friendly here and there's usually someone willing to help out.