What do you think is the best tactic in chess

I am not sure what you are asking for, and apparently nobody else knows either.

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A tactic is a combination that relies on a temporary configuration of the chessboard.

Very often tactics are only possible for a single move.

We train tactics with puzzle solving.

There are countless tactics.

The best tactic is always the one thats available and gives the biggest advantage.

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But maybe you meant strategies ?

A strategy is a plan you want to realize. To give a very basic example from one of my recent games:

My opponent had quite a while ago nicely agreed to trade me a minor piece for two pawns. 😈 So I had an extra knight and saw a really great outpost right in the middle of blacks position. All I had to remove was a single pawn that otherwise would attack this outpost. So I traded pawns and occupied said outpost. This knight was now very well positioned and would be instrumental in blacks ultimate demise.

Btw in many situations realizing a strategy involves tactics. Trading a pawn probably barely qualifies as a tactic.

Just like with tactis, there are a lot of strategies, too. And how well they work out always depends upon the current situation on the chessboard.

Maybe you are looking for something like this ? Just came out:

https://www.youtube.com/watch?v=kTON84W-b2Q

GM Smirnov has many other such videos.

Btw one of my favorite videos like this is from Anna Cramling:

https://www.youtube.com/watch?v=FB6wghKbFR0

I like removing the guard, especially when it involves a big sacrifice.

Take this position from an old (and, admittedly, not very good) game of mine, for example. White just played ...Kxa1??. Try to find the amazing(?) move I found.

Another one I like is discovered attacks. Particularly ones like this:

It's definitely not actually brilliant, but it feels good.

the checkmate