Your textbook certainly covers conditionals. If you don't have a textbook, I highly recommend English Grammar in Use by Murphy. type 1 conditional - real present/future situation I have $20,000 Canadian in the bank. If I find a new car for under $20,000, I will buy it. [This is a reasonable possibility because sometimes dealers offer a basic car at $19,000.] type 2 conditional - unreal present/future situation I have $15,000 Canadian in the bank. If I found a new car for under $15,000, I would buy it. [This is an unreasonable hope and the speaker phrases the condition as an unreal present/future condition.] type 3 condtional - unreal past situation Last year, I had $20,000 Canadian in the bank. I bought a used car for $14,000. If I had found a new car for under $20,000, I would have bought it. More information: https://www.ef.com/ca/english-resources/english-grammar/conditional/

если бы я купил машину, у меня не было бы проблем с ней bought, wouldn't have -- проблемы с машиной сейчас, в момент речи had bought, wouldn't have had -- проблемы с машиной были в прошлом, до момента речи (что должно быть оформленно временными показателями "когда", "когда я жил в Лондоне" итд)

they are both correct / but give different moods, the second conditional is about the practicaliity, the third is more emotional

If had bouth = If + past perfect (third conditional)/ If bought ... If + simple past (second conditional), They are both acorrect.

As I understand, are two sentences correct?