Seeking advice in building a repertoire with 1. d4 2. nf3

Before asking my questions, I'll describe what I'm currently playing in case I'm getting anything wrong

1. d4 d5 2. nf3

• If black plays 2. e6, I proceed by playing the Colle normally
• If black plays 2. nf6, I play 3. e3 and against everything besides e6, play c4, usually entering one of the many quiet lines of the Queen's gambit declined
• If black plays 2. nf6 3. e6, I just proceed with playing the Colle normally

1. d4 nf6 2. nf3

Based off my experience, black has more responses to choose from after this move order. I choose to play the Torre attack against most of them to avoid playing into Grunfeld and King's Indian

• If 2. e6, I play the Torre attack proper as the 1. d4 d5 Torre move order is uncomfortable to play after black plays ne4
• If 2. g6, I still play the Torre attack and wait until black commits to moving his D pawn to d6 or d5 before choosing to play e4 or e3
• If 2. d5, I just play what I usually play against 1. d4 d5

That's basically all I know for certain so far

Now my questions:

What should white play if black plays an early c5 but doesn't commit to keeping the lsb behind the pawn chain with e6? Example: 1. d4 d5 2. nf3 c5 or 1. d4 d5 2. nf3 nf6 3. e3 c5. I've just been playing it like a Queen's gambit accepted but trying to hold onto the pawn as white has the extra tempo

Are there any other sidelines that I should be aware of?

What response to the Old Benoni (1. d4 c5) fits most with the rest of the repertoire?

I'm aware this is a very long post and thank you in advance if you choose to respond to any of these questions

ok

ok no Colle's actually fun

Torre is admittedly basically just a London with the bishop on g5 but I like it better that way

at least it has a cooler name

switch queen's gambit instead of Nf3

no

I play similar, though I play 1.Nf3 and 2.d4. (Slightly different move order, to avoid the Englund Gambit.)

There's nothing wrong with facing the Englund Gambit, of course, but I find that 1.Nf3 sucks some "fun" out of the opening for Englund Gambit lovers.

Regarding an early c5: I just play e3.

With the tension on d4/c5, white can wait until black captures on d4 ... White recaptures with the f3 knight, or with the e3 pawn, depending on which he prefers.

If black doesn't capture on d4, then white can exchange on c5, push c2-c4 (if it hasn't been played already), and fianchetto his bishop at b2.

d4 Nf6 Nf4 c5 d5... transposition to Benoni... after c4 it's playable but d5 gives more of an advantage. Of course that would benefit me since I play the Benoni

I believe that it's widely acknowledged white gains more of an advantage by pushing d5 (as in the main lines of the Benoni) but yes, this is a very solid approach. What deters you from pushing d5?

Thank you! I hadn't considered playing a fianchetto but I'll experiment with it

Regarding the Englund gambit, I actually enjoy playing it as I can just get a very solid opening advantage by following this refutation that I found in literally 2 minutes while tinkering in the analysis board

Be aware that if you're meeting 1...c5 with 2.e3, Black has the option of 2...cxd4 3.exd4 d5, transposing into a Caro-Kann.

tbh if ya play d4 nf3 i would just quit chess (im joking lmao). 1.D4 2.C4=best opening.

I don't enjoy playing either the Benoni or Grunfeld as white and that's like half of what I face if I play d4 c4

On the other hand, 2. nf3 allows me move orders that allow me to play the Colle-Zukertort attack which is a lot more fun than dealing with someone who knows 20 moves of Benoni maneuvers

1 d4 d5 2 nf3 c5 3 c4 is what i play. it can transpose to a main line qga, tarrasch and some other line, but since i have taken up 1 d4 and 2 c4 as my repertoire i don't mind. there is 3 e3 trying to get a colle anyway. it is easier but that can also be said for black.

i find the colle systems rather dry especially if you avoid getting an iqp. ironically its counterparts in the reversed positions, namely the semi slav and the queen's gambit accepted,  are generally sharp. i suppose that's because white feels obligated to fight for an advantage there while here black doesn't have to.

just play the bongcloud against every opening you encounter and you'l be on your way to be the new world champion.

simple

Extra tempo + center+ rapid queenside development + open file to attack the kingside should black castle short seems very equal to me

I think even bg5 works in that diagram, forcing a concession from black with f6 or conceding the fork 

I've stumbled headfirst into a few veteran Benoni/Benko players, and the experiences haven't always been pleasant ...

These days, I'd rather steer the game more toward my comfort zone than stroll into their favorite defense.

With some Benoni/Benko players, the moment you play d5, they're practically leaping up and down in celebration.

After:

It looks like a reversed queens gambit declined, not sure if you enjoy playing those positions or not

No one is listening to my advice about playing the bongcloud gahhh

I suppose this is what happens when a 1400 tries to give an 1800 some advice people