Openings for a 1100

Is c3 a good move?

Honestly, play what you find the most amusing. Learn some of the theory from youtube videos. I love https://www.youtube.com/channel/UCM-ONC2bCHytG2mYtKDmIeA personally.

As white:

1. d4! Learn the Queen's gambit for white. If black accepts the QG you will usually get a far better position, if you know the opening. Otherwise you often end up with a slav, QGD, or an indian game. Very versatile

As black:

2. Scandinavian defence! A lot of fun. A video on it: https://www.youtube.com/watch?v=OGehkS76Q24&t=1732s

Yes

enough of joking on this: any opening is playable in blitz starting from more obscure one to most hypermodern. 

you need to know enough lines deep down 15 moves to play something serious tournaments to get upper hand on opponents But that is required atleast 1700 + rating. till then opening theory is pointless. 

chose some interesting stuff eg. as white c4 (english)or d4(QPG/QGA/QGD) or f4(birds) or e4(KPG/Sicilian/french) or nf3(Reti/KIA)  etc.

as black Grunefield/KID/Dutch against d4 ; sicilian/caro-kann against e4 ; anglo-indian or anglo-dutch or anglo-grunefiled or QID formation or c6 caro-kann defensive against c4 from white etc. 

and most important plan would be keep playing without repeating same mistakes after these. above everything do not spoil ur enjoyment over the games ie. vital part  

thx

cool

https://www.everymanchess.com/the-nimzo-larsen-attack-move-by-move

This is the latest book published on this opening. After e4, and d4, I play this opening myself.

https://www.amazon.in/Play-1-b3-Nimzo-Larsen-Attack-Friend/dp/9056912569/ref=pd_ys_c_rfy_gb_1318121031_17?_encoding=UTF8&pd_rd_i=9056912569&pd_rd_r=G0FNXM8YRF093FVYG5VT&pd_rd_w=8uNod&pd_rd_wg=6m8iM&psc=1&refRID=28DBZ8BA7TMC1C7TEXC9 

https://web.archive.org/web/20140627052905/http://www.chesscafe.com/text/hansen175.pdf

https://web.archive.org/web/20140627104235/http://www.chesscafe.com/text/hansen114.pdf

Seriously the French and the Kings Indian Defence, two of the most theoretical openings evah?  wow, I would have thought that learning the London system or the Colle or the Stonewall would be easier, much easier, the Semi slav as black (which is the Colle with reversed colours) and something not overtly theoretical against 1.e4 like the Scando or even the Caro Kann would be the way to go. But the KID? wow

"... [The Semi-Slav Defense] leads to some of the most complicated positions in any opening and has been heavily analysed to move 20 and beyond. ..." - GM Neil McDonald (2001)

Nice, you lucked out in the end there. You seem to show some tactical promise for an 1100, but your opening was clearly amateur. I suggest starting with an opening I myself invented, which has positive reviews from powerful players: https://www.chess.com/forum/view/chess-openings/ethiopian-opening

Sigh amoung others publication in my library I have 'Win with the London system', by Sverre Johnsen and Vlatko Kovacevic.  I haven’t looked at it for ages. I took a look inside and was almost sick.  Clearly opening theory is not for me.

I will recommend you to get a repertoire book for beginners, something like "My First Opening Repertoire for White" by Vincent Moret or something similar . The book is ideal because it will not give too much variations, only enough to give you an idea how to play through the opening. If you are really serious about learning, you should have a system to repeat what you learned regularly by spaced repetition: things that you know you will repeat less often than the lines you already forgot. It is impressive how many of us buy chess books and do not work seriously with them. Go to the website Chessable to see the book. Everything in this website can be learned by spaced repetition. 

Anyway, good luck!