One of the things that helped me improve a lot was watching streamers play. Baalorlord as previously mentioned is great. I’ve also watched a lot of videos from Jorbs and Frost Prime.

They all have some videos specifically targeted toward newer players where they explain their thought process but I’ve also gotten a lot of value out of just watching them do normal runs. I like to figure out what I would do in each situation and if they do something different I try to analyze why they made that decision instead. There are many cards that I didn’t think were very good until I saw an expert using them.