In this game, many factors are very important. And in each discipline you need to have different skills. But it is very important to determine for yourself your strategy of the game and develop it. After all, we all play in different ways ...
Is a skill set that makes the difference, reading the range of the opponent is one of the main. But to become a full player you need to master various skills
Skill is a big part, but if you simply know how to play the game is the biggest plus. Reading the player is good, but with the best hand reading the player take a back seat.
The ability to read another player seems like a harder skill to acquire. Anyone can teach what range of hands to play, heck. Just look at a table that shows which cards to play.
So assuming that you have neither and are looking to gain one, I would work on discipline first. As you learn that, you will also get better at reading players and be in a better position to take advantage of the moments you spot a tell. It doesn't help to find a tell if you already lost all your chips playing hands you shouldn't have gotten into.
I believe stress should be placed first in the discipline in the hands you're playing.
When you try to understand why you play certain ranges from the correct position you start to understand what ranges your opponents can be playing with context to their playing styles.
Once you master ABC poker you then gravitate to try and understand the possible ranges your opponents are playing, you try exploitative poker when you mix up your ranges based on what your opponents are playing.
I can't see how you will master reading other players hand ranges without understanding why you should/shouldn't play a given range yourself.
Would somebody give me a list of poker 'skills', and describe exactly why you think they are skills and how you acquired them. Compare those skills to ones that a scientist or a doctor have.