Best Openings under 2000 elo

Chess Openings Tier Lists by GM Hikaru Nakamura and IM Levi Rozman (GothamChess)...

https://www.youtube.com/playlist?list=PL4KCWZ5Ti2H43-gcoByRnZs5fVR_Lg133

Chess openings are rated in terms of how appropriate or intrinsically effective they are vis-a-vis player skill level - i.e., beginner vs intermediate vs GM’s, etc. Particularly in the beginner lists/videos they frequently refer to some openings as "garbage" or "bad" (IMO an unfortunate choice of terms). However, these qualifiers are meant to convey how appropriate the specific opening is for the level of player being discussed, in terms of, for example, how much so-called "theory" (i.e., documented variations) the opening encompasses, or how much emphasis the opening places on positional versus tactical skills in order to play it well.

So, an opening they refer to as "garbage" for a beginner may be appropriate for higher rated players who would typically know more of the theory for particular openings and have a more highly developed understanding of positional concepts. For each of the openings discussed be sure, also, to pay attention to whether the evaluation is from White’s or Black’s perspective.

You might also find something of interest and/lor relevant to your question in my blog article...

Chess Openings Resources for Beginners and Beyond…

https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond

Catalan and London system