there is why, that's why, that's how

[mcadhu]

Respected,
I would like you to clarify me.
Where and how can we use "there is why, that's why, that's how".
what is the meaning of each one?
why we shoud use these?

It would be better if you could give some some examples in this regard.
Please correct me If i am wrong, I appreciate your help.
Thanks in Advance.
Regards
Madhu

[konungursvia]

They all mean "this is the reason for which" but I feel "there is why" is incorrect usage.

Examples:

He lost all his money on the stock market. That is why he is feeling sad.
He speculated on penny stocks. That is how he got into trouble.