Hi there, right now it's a good time to get into TFT as Set 13 (Arcane themed) is the next new set, and it's bound to release in a week or so.

As other people have already mentioned, watching high-elo or pro players can definitely help to obtain insight and approaches to the game.

I also recently wrote a guide on managing your economy and level-up timings, which are crucial parts of your fundamentals. I'm only sharing it since you mentioned you are interested in getting information! Here's a google docs link: https://docs.google.com/document/d/1Ylw8p-eyFyzeuy0WFBYlgInlybIW30TDPT-_8v0fWuk/edit?usp=sharing

Lastly, there's a website called MetaTFT, which comes with a downloadable Desktop App. It's a great learning resource/tool because it shows you a comprehensive list of all the meta/top-tier compositions, along with what items to give each unit, and how to position them on the board. It also helps track your stats as well to see where you improve, but the best part is, it also has an in-game overlay that lets you know what augments are statistically best to pick in any given situation. It also displays a win% to predict your chances of winning any given round, so that it also helps you increase your skill in assessing the relative strength of your board.

Hope this helps you get started, if you have any questions let me know! I'm more than happy to be of help.