what is the best openings

Stockfish says that the Semi-Slav Defense is best.

First, understand that there is no "best" opening.  But there are many good, very playable openings, albeit with lots of inconclusive debate over which are better than others.  Also, for less experienced players some openings may be more or less appropriate - easier or more difficult to learn and play - than others.  The following present many interesting possibilities...

Chess Openings Tier Lists – GMHikaru (complete, beginner thru GM)…
https://www.youtube.com/watch?v=M9CwH47r6og&list=PL4KCWZ5Ti2H43-gcoByRnZs5fVR_Lg133&index=4

In the tier lists, chess openings are classified in terms of their appropriateness vis-a-vis player skill level -  i.e., beginner vs intermediate vs GM, etc.  For a given player level, the openings are rated and categorized into six "tiers", from "legendary" to "garbage" (the latter being an unfortunate choice of terminology, IMO).  These qualifiers are used in the context of not only the general effectiveness of the particular opening, but also how much so-called "theory" (i.e., documented variations) it encompasses, or how much emphasis is placed on positional versus tactical skill in order to play it well.  So an opening they refer to as "garbage" for a beginner may in fact be appropriate and playable for higher rated players who are assumed to possess a more highly developed requisite knowledge base and skills set.  For each of the openings discussed note also whether the evaluation is from White's or Black’s perspective.

For beginner-intermediate players check out ‘GothamChess’ (IM Levy Rozman) on YouTube for recommendations and quick tutorials on various openings....
https://www.youtube.com/watch?v=NFod-ozimmM&t=103s

https://www.youtube.com/watch?v=Qdyik5UwBtM

https://www.youtube.com/results?search_query=gothamchess+openings

https://www.youtube.com/watch?v=rmbU97iftC8&list=PLBRObSmbZluTpMdP-rUL3bQ5GA8v4dMbT

‘Hanging Pawns’ openings videos on YouTube…
https://www.youtube.com/c/HangingPawns

Chess Openings - Ultimate Guide to the Openings of Chess
https://chesspathways.com/chess-openings/

Openings Guides – SimplifyChess.com...
https://simplifychess.com/homepage/openings.html

Chess Openings Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/openings-resources-for-beginners-and-beyond

more helpful chess resources, including openings and book recommendations, in my blog...
https://www.chess.com/blog/RussBell

Ruy Lopez, see Figure 30 https://arxiv.org/pdf/2111.09259.pdf  

Thanks for the help, I am new to chess and willing to learn more and you guys are helping me, thanks.

RussBell is right, there's no best opening, it depends on your way of playing. As I'm not good at tactics, when I play black, at my (low) level, I use the Caro-Kann because it's safe and slow, easier than the Sicilian, e.g., and you can wait for your opponent mistake to win (I know it doesn't sound fair)

Thank you