What types of games do you like? What consoles do you have? What length of run are you looking for?
This is an incredibly hard question to answer because what one user finds "easy" or good for a beginner, another user might have a lot of difficulty with. Either way, we'll need more information before anyone can toss out any suggestions/ideas.
Yeah, you should try speedrunning a game you know very well, something you have played more than once already. If there is no such game or you would prefer to learn some new game to run, check what games you have on steam and check the leaderboards for that game here, try to choose something not too long for your first runs.
Considering the OP deleted their post I don’t think it’s worth replying to this thread anymore.
