How can I avoid this situation?

How can I avoid this situation at move 4 when he threatened to take my pawn with the knight and bishop and i could only take back with my queen, which would have been captured afterwards? My opponent played d4 as first move and I'm not experienced with d4 because most people at my level play e4. 
I found the best response but it's sacrificing a pawn and the opponent still has 0.84 advantage after it. So how can I prevent coming into this situation because I felt like I just played normal solid moves?

3 .., a6 or

3 .., e6 4. Nb5, Na6

I like going a6.

When you see this London Bishop come out to f4 but they don't go for the London Setup, that means they are playing what's known as Jobava London and the plan is to go for that pawn.

You did well to spot the issue in your analysis! a6 prevents the problem... In general playing these a6 or h6 moves is not recommended... Only play them when you analyzed and concluded that they are objectively one of the best options.

Here a6 is that because White has revealed his main plan is to go for that pawn and you stop it

I have seen a lot of GMs throw out c5 in these London System looking positions. If white plays Nb5, then Qa5+!!

I would have done A3 on the 3rd move for black to prevent white's knight to B5. Isn't that the "fried liver" attack by white?

Why?

White's Nb5 is a silly idea. Why discourage it?

Napoleon Bonaparte used to advise:

"Never interrupt your opponent when he is making a mistake".

ah nice so I learn something useful too! thanks

I guess my inclination to go a6 was because Jobava is more common in quicker time controls and it feels like it throws them off and that way I know I'm getting a more familiar middle game.. But I'll try going Bb4 next time.

Also OP is 500 so I thought just the fact he understood the double attack on c7 was a plan for White was good for his level.

Do not play 3...Nc6 on the first place- there are systems based on ...a6, or others which counter Nb5 with ...Na6.

That said, you may also play 3...Nc6 which isn't so bad as it initially looks. A guy even bothered analysing this oddball, and claim that Black has a great game:

https://www.youtube.com/watch?v=56SwUHxGGmE

Oh... and last but not least: That 0.84 computer evaluation is totally useless for practical play. All that matters is how easily your game is flowing, and how difficult is for your opponent to counter it.

Your mistake is playing into his plan. You started with an indian opening, should have stuck with it.
1. d4 Nf6 2. Nc3 d5 3. Bf4 g6 4. Nb5 Na6 5. h3 Bg7 6. e3 O-O

Nice @blueemu I also play this line against this as well:

My favorite approach in this opening is the same as @FeedThePepperoni recommended, however, I would like to add a couple more lines so you can play the resulting positions more effectively

I suggest maybe trying a different opening, some great responses to pawn d4 are the queen's gambit or the slav, these are 2 of many openings you can learn through Chessmood. Chessmood is a chess training course developed by grandmasters to help players like you learn more techniques and develop strategies for unique moves that you may not have encountered. Chessmood has many resources and a fantastic community!

Click here to find out more: https://chessmood.com/?r=NationalChessBlasters

Good luck!

I definitely agree with what BioCode is saying. I have been using ChessMood for the past two years and my overall skill in openings and all sorts of theories have skyrocketed. I would recommend ChessMood to anyone who is looking to improve in this aspect.

I have to respectfully disagree with this take. Just because you lose a game with an opening doesn't mean you need to switch up your opening repertoire--it just means you need to practice it more and learn from mistakes you make in the opening. If you constantly switch the opening you play, you'll never become a consistent chess player. Of course it's nice to try out a bunch of different openings (especially when you're a new player), but the Queen's Indian Defense is an extremely solid opening played all the way up to Grandmaster games.

Also, kinda weird to put a referral link without making it clear that you make money off people getting subscriptions if they sign up from there.

Except OP hasn't any specific opening repertoire at all, and if any, considering the statements at #1, no so much against 1.d4, "rarely played at that level".

My advice: if something such bugs you too much in the openings, consider adopting a setup that do prevent such things to happen perpetually. d6 and c6 are valid options in that regard.

As for me, getting (long ago) second tired of the Knights & Bishops messing with my play via b5 and d5, I adopted forever the idea to keep a pawn on c6 at all times. It's so very solid. Yet, it doesn't mean you won't have a game to play for it.

Why is Nb5 a silly idea? Computer says it's the best move.

Which computer? On what depth setting?

The chess,com computer couldn't find its bottom with both hands.

After 4. ... Bb4+ at Depth:30 an older Stockfish gives = with a slight advantage for Black.

You are looking at 3. ... Nc6.

The line I gave is 3. ... e6.

Just about equal, but advantage Black.