Should I start studying if I want to stay above 700?


Below ~1500, the only thing you need to do in order to improve is practice tactics. There are many good tactics books out there, or you can use something like CT-ART. Or, you can just set the tactics trainer to unrated, select the theme and level you want to drill and go from there.
for me to cross 700 chess.com rating I mostly played 10 min games I never really needed anything else but to improve after that I recommend you look at tactics and mating patterns.

i got to 1100 without studying, just playing games is very effective. However learning/studying chess will probably quicken the progress as long as you still dedicate plenty of time toward playing.

Improving Your Chess - Resources for Beginners and Beyond...
https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond
Staying above 700 or progressing to 1500 is just a matter of eliminating blunders.
You do not need to study for that. Just blunder checking does it.

Staying above 700 or progressing to 1500 is just a matter of eliminating blunders.
You do not need to study for that. Just blunder checking does it.
that is a big part of it, but beginner players also need to start thinking about positonal play ie where to develop, where you should attack, etc. They need to have a firm foundation of positional play so they can continue to improve at higher levels.
Blunder checking will probably get you a lot farther, but it is not the whole picture. It is also a lot easier said than done.

Before I played my first game I bought a few books to understand the basic.....one good about opening and one on endgame and one on tactic and one from two coach from Russia...their basic chess lesson for beginners up to level 1500.
I did look at each book for a few hours and it didn't take long to get to 1200 on the net....
Of course I looked at those books many time in those few months to improve my knowledge....
The most important is to find an opening that you really enjoy and that you really feel solid and in control and the endgame basic and a good knowledge of the basic tactics....
And Think very carefully on each of your move and of your opponent move....and play slow game...not 10 min crap..unless you only want to have fun and not to play seriously and improve.
You should get to 1300 easily in a few months if you do that with of course a ton of played games...

Staying above 700 or progressing to 1500 is just a matter of eliminating blunders.
You do not need to study for that. Just blunder checking does it.
You cannot play good chess if you have zero knowledge of the opening principles and no understanding of any tactics and no idea how to play the endgame....you will not even know en passant or when you can castle etc etc etc...
It's like saying....you don't have to go to school and learn anything...just go get a job and you will be successful...no need of anything just to avoid any mistake while you work and you will be fine...



Staying above 700 or progressing to 1500 is just a matter of eliminating blunders.
You do not need to study for that. Just blunder checking does it.
While true, this is also about as useful as telling someone who is trying to learn Algebra to just do it.
To avoid blunders, someone must master basic tactical patterns. Thus, to improve their blunder check, they need to drill tactics.

Don't lose any material for free.
You want your pieces to be mobile and king safe.
Knowing this is enough "studying" to get you beyond 700... but it takes a lot of practice.
Looking at your last ~4 losses, you're still losing games before finishing your development.
As other people have already said: the most important thing you can do to stay above 700, is to quit dropping pieces for nothing, and walking into checkmate. In fact, if you do nothing more that learning to hang on to your own pieces while taking the pieces your opponent leaves unprotected, you'll be over 1000 in no time!
That said, if you like chess, a little study should be fun for you

Laskersnephew, you make it sound so easy. Of course, my problem is pursuing my own schemes while keeping an eye on my opponents', as I'm sure it is for many people.
The other thing is walking into forks and skewers. I do that all the time, though I've gotten much better (finally!) at anticipating the deadly opening and endgame knight forks.