As has been stated in other comments, the type of game you are looking at dictates what needs to be learned to get better.
Shooters require a different skillset than say an RTS, which is quite different from a turnbased Strategygame, which is completely different to a mechanical skillbased game like tetris, which is different to a card game like magic or Hearthstone.
If you are looking to get better at videogames in general, just play different videogames and try to identify what skillsets are required in them.
If you have a specific one in mind, or a genre, more detailed advice could be given.
As someone who codes basically only when AoC is around, and can solve like 70-80% of the puzzles, I am constantly wondering if this skill would be enough to get a job in the industry.
Obviously stuff like Git would still needed to be learned, but purely using AoC as a Benchmark of problem solving through using code, would that be enough?
As a livelong gamer and lover of video- and boardgames I might have a point of wisdom to share here.
1. You can learn a lot about other people when you play with them.
I found that especially in cooperative titles like Pandemic a lot of the players personality comes to light.
If I will ever be in a position to recruit people a round of pandemic with candidates might be one of the best things you can do to assess the following skills:
Communication
Strategic Thinking
Decisionmaking under Pressure
Leadership
Teamwork
Shortterm vs Longterm Thinking
Also a person that you got to know as a shy and calm introvert might be the complete opposite in a competitive gaming situation, where he might continuously rage and will not stop complaining about everything, completely dropping a facade.
You will also notice people, that have a tendency to cheat or look for other shortcuts (finding shortcuts or "hacks" within the rules is fine and something that I value in other players). Situations where someone asks to take back a move after new information has been revealed, or tries to get additional information through illegal means, because the game is "too hard" or "it won't hurt" or "I will not change my decision based on that" are likely to do so in other situations as well. Especially if playing alone or feeling unwatched.
How people deal with wins and losses - big and small - obviously will tell you a lot as well.
2. You can have a perfect strategy, everything planned out and still lose.
This has been mentioned below and applies especially to games that have rng involved, e.g. Poker.
Making the right decisions and losing shortterm, does not mean that your strategy is flawed.
The law of large numbers is at work.
3. Games are mostly about imposing arbitrary rules on a known situation. That's where a lot of the fun comes from.
You can apply the same mechanism in your daily life to make a chore or repetive tasks "interesting".
- Set a new highscore in doing the dishes with only one hand.
- You are only allowed to change the plugs of your vaccum cleaner three times for the whole floor.
- When cooking for the next week the temperature of your oven is limited to 100° Celsius.
- Answer your emails for a day without using words that start with a vowel.
- Try to rhyme every sentence that you speak.
Introducing such limits will improve your creativity and bring joy to mundane things.
4. Playing MtG did more for my vocabulary than all english classes I had in school.
5. Persistence is key to reach a goal.
I grew up with an Amiga 500 and a lot of the games that I loved had no save feature. Okay Boomer!
When I finally got to a new boss on level 2 with three lives that's all there was. I had three attempts to learn what he does and depending on how difficult it was to get there I might have to replay the 1st and 2nd level again for some hours to get another shot at him.
It was annoying, but it got me better and better and lead me to refine my strategies and value every resource I had.
This is a skill that I unfortunally lost over time.
Pursuing goals is really hard for me knowadays and I often ponder if - as I still play a lot - the way that games have changed also changed my approach on other things.
I find myself often looking for quick fixes - a youtube video on best strategies for a game, tactics for a specific boss. For me all that available information took away the need to really deeply dig into a game and get to know it inside out. And I think that is true for me on a professional level as well.
Shooters require a different skillset than say an RTS, which is quite different from a turnbased Strategygame, which is completely different to a mechanical skillbased game like tetris, which is different to a card game like magic or Hearthstone.
If you are looking to get better at videogames in general, just play different videogames and try to identify what skillsets are required in them.
If you have a specific one in mind, or a genre, more detailed advice could be given.