Can you help me fix a problem with Android Studio?

Question

android studio

Good afternoon. Please tell me why, after installation, it writes to me Missed sdk and all the consequences, I already made a couple of attempts, a lot of time in Google, scored, but now I need it again and again I can’t fix this piece of the program .. I already tried download this sdk but how and where it is, I have no idea, the output is the tools folder, I just didn’t do it with it (Dancing with a tambourine didn’t help). Help ladies and gentlemen. Thank you.