All of them are totally fine for black.
Weird Responses to Reti Opening
3 out of 6 are good. 1.Nf3 f5 is the Dutch Defense which is perfectly valid, and 1.Nf3 d6, which I play, is perfectly fine. 1.Nf3 d5 2.c4 dxc4 is one of the best responses to the Reti - take a look at this game for example (in the next post). If you don't understand these, maybe don't play the Reti and stick with 1.e4

1.Nf3 e5 is plain stupid, as well as 1.Nf3 f6. Nothing more to say about that.
1.Nf3 d5 2.c4 dxc4 is totally OK. Best move is 3.e3 (I do not like 3.Na3 very much because of 3...a6 4.Nxc4 b5 plus ...Bb7), when the most probable outcome is a Queen's Gambit accepted by transposition.
1.Nf3 d5 2.c4 Nf6 is not very good because of 3.cxd5 Nxd5 4.d4, followed soon by e2-e4. Your 4.e4 seems to offer Black some counterplay via 4...Nb6 plus eventually ...Bg4 with some control over the d4 square, while staring with 4.d4 this is much more difficult to achieve.
1.Nf3 f5 and 1.Nf3 d6 are perfectly good moves.

explain how f5 is any good and how there aren't better moves availble to rather choose d5
btw I forgot about another opening I have to encounter
explain how f5 is any good and how there aren't better moves availble to rather choose d5
btw I forgot about another opening I have to encounter
Lol you are arguing with an international master (@pfren). Also, no way is white 'way ahead' in the other opening you listed, which is one of the main lines. If you don't understand any of the main lines of the Reti, why do you play it? FYI 1.Nf3 f5 controls the e4 square and takes space.

debating and arguing are two very different things, the purpose of this forum is to learn so it doesnt matter if he's an IM or a GM as long as he can tell me where I'm wrong
f5 controls the e4 square... doesn't d5 do the same thing but also keeps the kingside safe?

1.Nf3 d5 2.c4 d4 3.e3 is answered neither by 3...dxe3 (risks ceding central control), nor 3...c5 (reverse Benoni/ Blumenfeld a tempo down) but rather by 3...Nc6.

debating and arguing are two very different things, the purpose of this forum is to learn so it doesnt matter if he's an IM or a GM as long as he can tell me where I'm wrong
f5 controls the e4 square... doesn't d5 do the same thing but also keeps the kingside safe?
1...f5 controls e4, and creates an assymetry from move one.
Risky? Might well be. So what? Can you exploit the weakness?
2.e4 has been tested many times, and white has no advantage.

debating and arguing are two very different things, the purpose of this forum is to learn so it doesnt matter if he's an IM or a GM as long as he can tell me where I'm wrong
f5 controls the e4 square... doesn't d5 do the same thing but also keeps the kingside safe?
1...f5 controls e4, and creates an assymetry from move one.
Risky? Might well be. So what? Can you exploit the weakness?
2.e4 has been tested many times, and white has no advantage.
I can't... that's what makes me a 1200

Even though Reti Opening is the Third-Most popular opening used by masters, I haven't seen any of the masters use it all the time Im on live chess or chesstv... and as black I have barely even encountered anyone who plays Reti Opening, but when I play it as white, many people give weird responses which make no sense, take a look
1.Nf3 e5?????
Now this isn't played much, but Ive played against it like 8 times on chess.com
it's no wonder that black is down
1. Nf3 d5 2. c4 dxc4?
this is one of the weirdest responses IMO to Reti Opening, after this, No matter how I react( don't take this literally) I'm up a move
1. Nf3 d6
Now I understand nothing about this
I agree it isn't exactly best play but I can smash you at least 19 times out of 20 with both colors in all of those positions.
Believe me you can't, I have a reputation for beating 1400-2200 rated people more than once

dont play the reti if you dont know the lines, then cliam the main line is wrong
lmao
the main lines include

Chess is a complicated game.Claiming that 1.Nf3 f5 and 1.Nf3 d6 are bad for Black is hardly adequate.Show why they are bad , where is the weakness or the target and how you will exploit it.
Let me guess , you actually have no idea!Chess is not a religion. You don't excommunicate moves , you just prove they are wrong.
like @pfren said, theres a weakness but its hard to exploit it in 1. Nf3 f5
but in 1. Nf3 d6? why would you play that? this move is bad only because there are better moves like Nf6 d5 c5 and some other stuff
Even though Reti Opening is the Third-Most popular opening used by masters, I haven't seen any of the masters use it all the time Im on live chess or chesstv... and as black I have barely even encountered anyone who plays Reti Opening, but when I play it as white, many people give weird responses which make no sense, take a look
1.Nf3 e5?????
Now this isn't played much, but Ive played against it like 8 times on chess.com
it's no wonder that black is down
1. Nf3 d5 2. c4 dxc4?
this is one of the weirdest responses IMO to Reti Opening, after this, No matter how I react( don't take this literally) I'm up a move
1. Nf3 d6
Now I understand nothing about this