You don't need a lot to get started, although you can spend many years learning more and more about it.  Here are the most basic things you need to understand - all on one page - click here.

There are many other card games using the same pack of 52 cards.  This is why bridge is different from all the other card games (and better) - click here.

We are going to focus on playing Minibridge, and will introduce bidding in parallel with that, but slowly.  This is how you play Minibridge - click here.