Where can I learn the basics for the player behaviour in an FPS game, especially the code for motion, gravity and jumping?

I have been working on that for a few days and I always get weird bugs ,especially when it comes to gravity and collision ....

Check out my youtube channel

The problem is that this distance_to_ground gravity method doesn't work for me. I keep manipulating all the values and tried many stuff, but many times the player keeps flying or ascending upwards. And even the video_screen variable makes some bugs in gravity although it shouldn't be related to all that .....

I think I need another kind of gravity/jumping code ....

Have you seen the following tip yet?
http://opserver.de/swik10/index.php?title=Gravity

It worked fine ,but the player gets on some models/blocks so easily. I mean these models have some height and the player should just stop when encountering them because they are high a little bit and I am not jumping. However, the player 'jumps' automatically on them ...

Srsly, if you would have read the tutorial instead of just copy and pasting you would know what code you have to change to fit your needs.

"Srsly" I already read the tutorial and tried several times but this still happens. And btw., the downloadable code has some stuff that are not mentioned at all in the tutorial.

Please, if you don't want to give a helping reply, don't post in this thread

Try on your own, starting simple. Just applying a z motion !AFTER!(in a separate call) a forward or side motion.
Then, limit the feet height, as your model will probably sink a little...and then build on that base what ever you want.

I'm saying this in general, because there are many ways to limit the feet and to implement jumping. I am limiting the z height of the feet with c_trace calls downward in my game...

Basically, its a struggle to get a bug-free FPS movement with jumping and proper collision. But there are numerous ways you can try and build it.

PS.: Tip - always try to avoid glide as much as you can. Use it only when you really need it. It uses up to 6? c_move calls to make your entity glide, it produces seemingly random results every time and its a nightmare when you come to the MP programming for movement and synchronization
For gravity, it'll be too advanced, but you can always try to implement gliding on your own along a surface normal...But thats for when you have the proper gravity method already.