If you’re just getting started in homebrewing, welcome! Here’s a great list of minimum homebrewing equipment required:
Extract Brewing starts with an un-hopped liquid malt extract. The extract is a pre-made syrup from the process of converting the starch in malted grains to sugar and boiled down.
The main reason to do All-Grain HomeBrewing is simply increased creativity. Brewing beer is an art, so why not take it all the way and be as creative as you want?