Opening against d4? I'm 1000 elo

So I analysed my games based on openings and I realised d4 is my very weak point when playing as black. I manage to lose 70-80% of the games somehow. Main reason being I try caro kann and it goes very badly (I am sorry I didn't know caro kann was against e4 only)

Basically I don't have any theory against d4. So my question is, what openings do you recommend that are not much complicated in the sense if my opponent goes out of theory, I should be able to handle it? Also please drop a link to resources if you have any specific ones. I prefer video, though other forms are also welcome. (Also if there are any pirates around please do leave some links)