Hi
I don’t know if this is the right place to post this?
But i’m a beginner in UE4, and what should i do/learn to become “better/good” at UE4
And I really want to make my first game, but i don’t have any ideas to a game.
And last how should i start and finish (step by step).
Thanks
You need to come up with a project to do first and do the research to learn how to accomplish each step. I would first do a tutorial on basic UI stuff and start working on a small project.
I pesonally would recommend you to take a look at some basic tutorials first (as mentioned -> the UI and I would recommend you the blueprint tutorials) and directly start with your first game -> you also need to know a 3d program, texture program,… to create a own game. When you are stuck with something, you can always ask your question here in the forum or answerhub -> we are always here to help 
Also… The most important thing of all… Don’t GIVE UP! 
One of the biggest hurdles to overcome is filling in the gap between “I have no clue how to make anything” and “next blockbuster indie game of the year.”
If you’re as new as I am, how about this video tutorial?
v=0Cmr4maZEyY
It shows you how to make pong step by step, which is less overwhelming than a lot of the other tutorials can be.