I am new at unreal engine what i need to know and best way to learn (help)

Hello i start unreal engine with assets pack in my case i use zombie multyplayer templte just to learn from something,i make my new level,my problem is that before i make any other level make change in some gui,hud,ui that dosent look like assets from marketplace.(i want change simple intro,gui,hud and that is easy parts)

I start with graphic,i have dlss and raytracing,but now how to add button in video settings to other player activate dlss for like 4 options and raytracing something like fortnite have.

Dlss settings have 4 options like quality,balanced,perfomance,ultra perfomance

Watch tutorials from this guy. He’s amazing, out of all the tutorials ive done for this engine (ive tried quite a few) his are the most explanatory and comprehensive. He explains all the nodes he’s using. Try him out, you’ll love him.

Level design speedrun videos are inspiring and gets you moving when you feel tired of watching more detailed videos which can get confusing at times.

This guy is solid gold. https://www.youtube.com/channel/UCOVfF7PfLbRdVEm0hONTrNQ