I won't go into why you might like to listen to what I tell you, but I would claim I know what I'm talking about.
Bipolar is manic-depressive, which means you go through rapid moodswings between mania and depression.
Bipolar Disorder is a group of disorders which used to be known, less precisely, as manic depression. It can present in quite different ways, but, usually, it involves phases of mania or hypomania, and phases of depression. Rapid shifting from one to the other is not a defining feature, and is relatively unusual (it's known as rapid-cycling bipolar disorder.) The changes in state can be separated by months or years, with long periods of equilibrium in between.
Bipolar type 1 doesn't mean you don't have depressive episodes, but that the manic episodes are elevated and more frequent.
No. Bipolar type I tends to involve more severe mania, reaching quite delusional states, whereas other forms can involve milder episodes of hypomania. Bipolar Type I doesn't mean you don't have depressive episodes, but it is possible to have only manic episodes. In fact, Bipolar Type I can be, and frequently is, diagnosed by the presence of serious manic episodes only.
If you have mania without phases of depression, then you're not bipolar.
As explained, completely untrue.
Manic syndrome isn't technically classified as a mental illness (although it should be in order to stay consistent with clinical depression) but has many concurrent illnesses and disorders: schizophrenia, tourettes, OCD, ADHD, ect. Those are all manic conditions.
I don't know what you mean by "concurrent" illnesses in this context. That doesn't make any sense in itself. The conditions you mention are not "manic" conditions, and that would be meaningless in a medical sense. Those conditions are in fact wildly different. Schizophrenia is a type of psychotic condition, whereas OCD is a neurotic condition, and ADHD is a neurological condition. If you mean that they could make you a bit manic, in the casual sense, then yes, you could see that. But, with the exception of Schizophrenic psychosis, you wouldn't expect to see episodes of clinical mania.