How can you tell if someone has bipolar disorder?

I was wondering, what are like the symptoms of bipolar disorder? I know its like manic and major depression, or there’s another kind? called like bipolar ii or something? like, its hyper manic and just depression? Any details on these? Also, could someone be able to suspect that they are bipolar or have bipolar ii (if that’s what its called)? Thanks in advance!

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