a.

I think white has better than weakening their own Kingside, but g4 isn't blowing their entire advantage either. I'd say g4 is playable, certainly a candidate move, but it probably wouldn't be my choice, so I guess I'm only half raising my hand, or just not raising it at all

I agree g4 is probably ?!

If I remember right, the engines said Nf4, and in somes lines you can even sac d4 pawn with Nd3 and then Ne5

Nf4 is an interesting idea, but I probably would just go with the simple Rac1 and develop a piece to the, potentially important, open file.

Well yes you can precede the whole sequence with Rac1 and if Na5 then b3

I see the engine likes Rac1, but I don't understand it. Normal would be Nf4 and attacking on the kingside.

g4 gives access to Qh6, and I guess Ng3... but neither of those moves are useful. In this kind of formation it's common for your attack to be done with pieces, not pawns. Use pawns when you need to create targets and/or open lines. In this position you have the e file, e5, e6, and the dark squares on the kingside, plus the c8 bishop can't really contribute.

Making two moves on the queenside in that position isn't bad, but it feels like showing off (haha, I can spend time moving around over here and you're still dead on the kingside)

To add to my other post though, another thing people often miss about pawn moves during an attack is they block your own pieces. For example a beginner might play g3-g4 then g4-g5 and think that it's aggressive, but in reality g5 is blocking white's knight and queen.

That's right! It's important to reserve some key squares for pieces. A classic one is c4 for the Knight.

Does anyone want to see the rest of the game? 

Hello. And thank you.

Maybe you are giving this more thought than I did, but Rac1 seemed like a natural move to me. Of course I had other candidate moves as well, but Rac1 was simple to understand I thought. The idea is simply to get a Rook to an open file and the Rook on a1 was white's only piece not really developed and active. 

It isn't really that I think the c-file will be somewhere the opponent would let me infiltrate, but rather I just want to contest this file before the opponent can take control of it. 

As @FangBo mentions, Rac1 ...Na5 can be met with b3 to keep the Knight out of c4. I don't see a reason not to play Rac1 and slowly improve the position. It is just a small improving move before embarking on Kingside ideas.

Sure, and maybe a GM would play it and say it makes a lot of sense... or disagree with me in other ways like saying both moves are the same... but it's just not a move I'd consider in that position.

I'd go for Ne5, trading knights, threatening the queen, and opening the position.

nice sacrifice at the end, but I feel your opponent could have played that better, maybe? Were those all top moves?

Nf4 was my first thought on seeing the position.

With black's weak dark squares and e6 pawn white is definitely better. If white can get a knight to e5 I think that would break black down.

After Nxe5 it gets rid of black's weak squares

Black could have definitely played better. The two knight retreats first Ng7 (better is Nd6) and then Nb8 (better is Nd7) are two obvious improvements. After the queen trade, black is already strategically lost, due to the fact that he can't move any of his pieces without losing material.

The kingside is where white should seek play.
Nf4 improves two pieces on the "correct" side (kingside).
Black has a dark square weakness, so in general white will try to activate pieces by posting them on dark squares.