What is the best source to learn by yourself?

There are a few sources. First of all, I’d recommend looking at the YouTube channels of Miodrag Perunovic and the St Louis Chess Club. Those two have the most intimately detailed videos on openings, oftentimes with upwards of 5 hours of content on one specific opening, so if you can find an opening that they have made a lot of content covering, that’s a great place to start. After that, books are the single best source for learning chess openings, but to find the best books, I’m going to recommend asking on the forums for open specialists’ recommendations rather than striking out on your own. If you want, you can try Chessable courses, Lichess studies, and some Chess.com blogs, but those are hit and miss on occasion.

To learn openings I recommend hanging pawns on YouTube and if you want to learn the Sicilian, use Molton on YouTube. For analysis in learning openings, lichess is better than chess.com in every way, with a database and engine.

Chessable by far. Just check out a free course there.

hanging pawns is not a good place to learn openings for what they post are not always the best lines/inaccurate

st louis chess club or an openings database work well (there are some sites online that also talk about openings)

Play the wayward queen every game, it is impossible to refute and you will checkmate them or win a queen and two pawns.

Hi! It is difficult to give an accurate answer without knowing you nor your games. You can find endless resourses but not every piece of information is relevant to your development. Normally you should discuss with a teacher/coach what is most suited to you.

I have a new blog that might be of interest to you. See the link to one of the posts that I think could be helpful: https://www.chess.com/blog/maafernan/chess-skills-development

If you wish customized advise just send me a message for details on my lessons. I´m a Chess.com coach.

Regards!

Your own lost games are a gold-mine of information on which parts of your game need more work. Analyze them YOURSELF (not just by computer... use your own brain) before using an engine to look at them.

https://chessmood.com/?r=DfIjbsmZgGunEbo2DLQ24vd2PiZl0mpJ has a lot of courses and some free content

@1

"what is the best source to learn chess openings?" ++ Just play and analyse your lost games.

'just forget about the openings and spend all that time on the endings' - Capablanca

Use a good chess book with explanatory text, and then analise your games with the help of the book and the chess engine, while building an opening repertoire with adequate software for reference, here the best I know is the tree/mask of Scid/Scid vs PC database. Use the database to explore opening lines in games played by you and others as well. Unless you are a chess professional, or want to became one, play for fun and chose the repertoire that is best suited for your style of play.

The book "Logical Chess" by Irving Chernev looks like it would be just what you're looking for. I'm really happy with it. Definitely check it out.

I'm sorry but you are EXTREMELY wrong.

It can be easily refuted and can be used by black to gain an advantage in development and may also get your queen trapped. Please send me a PGN of the line you're suggesting so someone can learn something from the other :-)