Please, What is madda and types of madda? explain in the types.

salamun'alaikum,  please What is madda and types of madda?explain in the types.

Wa alaikum assalaam wa rahmatullahi wa barkaatuh,
You can view the lessons on the mudood (plural of madd)- which means lengthenings, at the following links.  You can continue clicking through the links to the next lessons, so we did not post all of the links: