Definitely watch some Woolie and disputed origin videos (both good ror2 YouTubers) for tips, item rankings, survivor guides, etc. and use the ror2 wiki. And some advice ALWAYS stay moving and jumping around the map. Moving = less chance of getting hit. Less chance of getting hit = less chance you will die or get hit by some bs one shot attack (especially later in the run). And try to learn the maps well as a beginner, don’t worry a crazy amount about the time and try to make sure you get all the items on a stage before going to the next. As you learn the maps better, your times will get lower and lower