What should 1400 USCF rated player study?

One more thing, how long do you reccommend studying for per day?

If you have a USCF rating that means you are playing OTB tournaments at long time controls. The first piece of advise for a 1400 rated player, especially a young one like yourself, is to take your time during the game. When your game is over, take a look around, notice how in the under 1500 section of the tournament almost all the games are over but in the higher section most of the games are still in the mid/late game. Higher rated players might not be any better in their chess knowledge... often they are just more careful and avoid game losing blunders by using their time. 

As a more direct answer to the question you asked about what to study. In addition to tactics I would suggestwatching the chess.com videos on king and pawn endings also rook and pawn endings. These are common endgames where you need to know the technique. These seemingly simple positions require acuracy and many 1400 (and better) rated players have gotten winning positions against higher rated opponents only to be unable to finish them off due to a gap in their endgame skills.

Thanks for the helpful tips!

Tactics...endgames...tactics...tactics

Sounds like a common theme, thank you very much.

depends upon your schedule. My lesson 001 asks, how much time do you have for chess? If you have plenty of time, spend it analyzing your online games and catch a video or two of mine every day.

A lot of people recommend studying lots of tactics. I don't. You need to know basic patterns but after a while, they become overkill and not an efficient use of your time. Once you have solved some tactics you know how to look ahead. Most positions you will be in do not involve tactics. They involve developing and coordinating your pieces. Yes, you need to look out for tactics, and prevent them, but they come about naturally if you use your chess pieces wisely. For a tactic to occur, one side must blunder. If you play a solid game, you will blunder less and recognize when your opponent is making errors, and then you will instinctively know to look for tactics. 

I tend to choose my candidate-moves for analysis based on checks, direct threats, moves indicated by the pawn structure (ie: a pawn chain indicates that you should try to form a head-duo) or by my operational plan (Operations is the level in between Strategy and Tactics), and moves which make one of the above options possible.

In the example above, the move Be2 (which seems so odd-looking and counter-intuitive that at first sight it looks like a mouse-slip dropped the piece on the wrong square) made my list of candidate-moves because it threatens Bg4+ with immediate disaster for Black. Calculation then showed that the c2-Knight is immune to capture, and that Black has no reasonable defense to the threatened check at g4.

I just finised up lesson 001 and thought it was amazing! Thank you very much!

OK, I think I see where you're coming from. 

Thanks for the help!

At 1400 USCF games are generally decided by blunders, and tactics.  So obviously the bester you are at pattern recognition, the fewer blunders.  What will also help is to ask yourself 3 questions before and after each move:

1. Do I have any checks/checkmates?

2. Do I have any captures?

3. Does my opponent have any captures?

Look at all captures, even the bad ones.  This will help increase your board vision, by looking at the entire board.

From most important to a little less important IMO:

1. Study your own finished games with computer analysis

2. Look through master games, especially in the openings you play

3. Study basic endgames

4. Tactics puzzles

You need a little of everything there, but if time is limited I think that is the order of importance. This, and playing games more carefully, is how I got from 1300 to 1600+.

Thanks. As my video explains, ask 10 players how to improve and you get 10 different, but good answers. This thread proves that. All suggestions will help but I picked out the methods which worked best for me and as noted, will maximize your time for the best returns. There are many roads to masterhood, but these worked for me.

Ill try it thanks! Do you think it is is possible to get to 1800 in one year? There is this special tournament where students rated 1800+ get to play in a fancy tournament and that has been my goal ever since.

Be honest...but ask yourself why you want to play in that tournament?

Is it because its "fancy"?

Your #1 goal should be to have fun.  If youre not enjoying chess, youre not going to want to study, and improvement will be slow, and painful. 

I have played in some nice tournaments, and honestly, after the first one, the importance of where you are wears off.

Well its kind of goal I made myself. I really just want to achieve the rating of 1800+

You should bear in mind that rating follows playing-strength, not vice-versa. In other words, improving your chess understanding will eventually increase your rating, but adding points to your rating will not necessarily improve your grasp of the principles of the game.

My rating didn't really start to increase until I decided to ignore it.

+!!

Excellent advice.  The worst stumbling block to improvement, is worrying about your rating.   If you can let go of the rating, and have fun, improvement will come.

Agreed with the above posters, you need to have fun and find what you're doing interesting. Otherwise you won't improve much and it will all be in vain.

Wow, never really thought of that, thanks!

Bladezii was banned for cheating, so I would be cautious following his advice...