I won't bore you with all the rules. There are many places where you may find them. Just don't become like one writer whose articles resulted in him being called 'the comma man.'
I'd like to introduce you the 'floating'comma. To give you a clue I'll quote Mohamed Ali, "Float like a butterfly..."
The first comma butterfly I've ever seen in my garden floated from place to place before decided on a place to rest.
|Comma butterfly on buddleia flower|
It could not decide on where it should position itself and was confused by the number of flowers to settle on.
|Comma in a different place.|
Eventually it changed it's mind and abandoned the buddleia altogether.
|Comma on forsythia bush|
This is one comma that I would be delighted to see at any time. If I had a lot of these I would be quite content to be called 'the comma man.'