I know I could have done it much better but sometimes there are no second chances.
I have had many chances where I could have done something really cool but didn't do it because I was too scared.
This is the explanation I got:
The phrase "could have" is used to mean that somebody was capable of doing something, but he actually didn't do it.
Please read the below line:
The best thing I could have done was what I did
I did the best thing that I could have done
Here, I want to understand what is mean by "could have".
1. Does it mean the person was capable of doing it but actually didn't do it.
2. Does it mean the person was capable of doing it and actually did it.
3. Does it mean the person was capable of doing it but it doesn't matter whether he did it or he didn't do it.
I think the 3rd option is correct.