For polish speaking people here, recommend Tomek Jaskółka's videos
Resources For Improvers

Hey everyone!
I'm sharing a collection of powerful free and high-quality resources that can really help you improve your chess—from the basics all the way to 1600 and beyond. These have helped me and many others stay organized, learn efficiently, and level up faster.
Feel free to bookmark and explore at your own pace! 📈
📘 OPENING TRAINING
🔄 Chessable Free Courses
https://www.chessable.com/courses/free/
Practice openings with spaced repetition. Great for London, KID, Italian, etc.
🎥 YouTube Channels
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ChessBootCamp very underated
- Gotham chess steps serie if i find something else ill post it here

for arabic speakers watch takkat chess amazing courses from high level books like mastering chess strategy or attack like mikhail tal

Hello Improvers! Want to master the art of the endgame? Here's an in-depth playlist from Danya's YouTube channel that teaches how to do just that! He explains all kinds of principles in an easy-to-understand fashion and does detailed analyses of each type of endgame. All in all, I highly recommend a look! The link to the playlist can be found here: https://www.youtube.com/playlist?list=PLT1F2nOxLHOfQI_hFiDnnWj4lb5KsviJ_.
From the videos that I've watched so far, it has been extremely instructive and helpful to develop my positional thinking and tactical awareness as well.

I can also recommend GM Igor Smirnov's chess tutorials. I learned plenty of useful information from them. He mostly works on example positions and makes videos mainly on openings. He has some videos for the middlegames and the endgames, but I think that his videos are very helpful for new and even advanced chess players.

How to stop losing rating points at chess by implementing a stop/loss system is explained in this video. I think a stop/loss of 25-50 rating points would suit me pretty well. https://youtu.be/UyCdY5gE0oA

Here's a free course on endgame basics. I think it has definitely helped me.
https://www.chessable.com/basic-endgames/course/6371/

https://www.youtube.com/watch?v=5eW6Eagr9XA
This is probably the best chess related video that doesn't teach you chess instead how to become better at it.
Of course it's Veritasium

I also made a study about the Sveshnikov, it's not really in that much detail but I think it has some good analysis in it.
https://lichess.org/study/TprktJl1
FM Nate Solon has a blog, Zwischenzug, and I like his post on how to remember your openings, in particular, the blank slate drill. I wrote a small blog post on how I did in the drill here.