What is an extra move in Mancala, and can you have more than one?
Note: Mancala is actually a family of games, not a game itself. Since you call the game 'Mancala', I'm going to assume you have a commercial Western version of Mancala, which means you're very likely actually playing Kalah.

A move in Mancala always means "take the group of stones from one of your pits, and sow them all again". So yes, it is just "like in the beginning".

For any move, if the last stone in the move falls on your store, you take another move. You can have many extra moves if you keep finishing your moves in your store.