don't care /doesn't matter/don't mind

[Molly Boblett]

Hello!
I'm a bit stuck on how to explain the difference/when to use
1.I don't care
2. It's doesn't matter
3. I don't mind
I'm new to this forum and I couldn't find an answer to this question, so please forgive me if this is a repeat.
Thank you!
Molly

[Gray]

[Kitosdad]

1.I don't care
2. It's doesn't matter
3. I don't mind

1. I have no interest in the matter. ( I am finished with the subject. )

2. It is irrelevant. ( It's not really important. It's trivial. )

3. I don't mind , if you smoke. ( I am OK about it. )

Many other explanations, obviously, but these are the basic meanings.
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