You shouldn't... tactics and things like that are soooo much more important at the U1000 level, if you can't see a tactic or undefended piece no book will help.
What books should I read as a 400 rated player in order for me to improve?

Do puzzles on chess.com or somewhere else, a lot... not in a book... you need to do a lot to pick up patterns and undefended pieces...
Do puzzles on chess.com or somewhere else, a lot... not in a book... you need to do a lot to pick up patterns and undefended pieces...
I think we'll have to agree to disagree on that

First: Don't play blitz if you want to improve.
Many people say, "Oh, you need to do 15|10 at the VERY LEAST," but most of those people are hypocrites. Do whatever time control you want, but IMO rapid is the best for learning, it doesn't need to be long, just 10 minutes.
Also, take your time. Move fast enough so that you aren't too much behind your opponent, but just don't move super quickly. Learn a few opening principals, then tactics tactics tactics. And learn your basic endgames.

Do puzzles on chess.com or somewhere else, a lot... not in a book... you need to do a lot to pick up patterns and undefended pieces...
I think we'll have to agree to disagree on that
Difference of rating bro.

I recently finish reading play winning chess by Yasser Seirawan and would like to get more recommendations at my skill level. I already knew a fair amount of concepts in the Winning chess book so maybe a book a notch higher than that book would be great. If possible please give me some advice from my games, most of the recent games I've lost today is from me resigning because of the dumbest blunders.
1. If all you're going to play is speed chess, then studying is pointless. You are not giving yourself enough time to implement what you are trying to learn into your games.
2. At your rating level, the only 2 things you need to use an engine for are:
a. Missed tactics.
b. Blunders.
Do puzzles on chess.com or somewhere else, a lot... not in a book... you need to do a lot to pick up patterns and undefended pieces...
I think we'll have to agree to disagree on that
Difference of rating bro.
Surprisingly unconvincing answer!

None, I am a living proof because I havent read a single chess book and got to 1550. It even easier for you - from 400 to 1000 you only need to not give any free pieces, take every free piece and thats it. Check the yt series from chessbrah called Building habits, how to improve at chess and you should be fine.

Though I've never gotten there, I'm pretty sure you only read tactics books if you're trying to break the 2000+ barrier.
I recently finish reading play winning chess by Yasser Seirawan and would like to get more recommendations at my skill level. I already knew a fair amount of concepts in the Winning chess book so maybe a book a notch higher than that book would be great. If possible please give me some advice from my games, most of the recent games I've lost today is from me resigning because of the dumbest blunders.
practice attacks and defenses,and sacrifice when its right , for now, i would recomend not reading for answers just play and analyze that

I recently finish reading play winning chess by Yasser Seirawan and would like to get more recommendations at my skill level. I already knew a fair amount of concepts in the Winning chess book so maybe a book a notch higher than that book would be great. If possible please give me some advice from my games, most of the recent games I've lost today is from me resigning because of the dumbest blunders.
practice attacks and defenses,and sacrifice when its right , for now, i would recomend not reading for answers just play and analyze that
I wouldn't take the advice of a 377 rated player.

I recently finish reading play winning chess by Yasser Seirawan and would like to get more recommendations at my skill level. I already knew a fair amount of concepts in the Winning chess book so maybe a book a notch higher than that book would be great. If possible please give me some advice from my games, most of the recent games I've lost today is from me resigning because of the dumbest blunders.