Help with Brushes

Hello!

I am fairly new to digital art and decided I would begin using Photoshop. I recently scanned in a drawing and began to ink it using the brush tool, as the pencil was rather rough. Everything was going good until all of a sudden, my brush began doing funky effects. I looked at the brush tool in the tool box and I somehow activated the 'art history' brush.

My first plan of action was to 'click and hold' to see my other options, such as the airbrush or the brush I had been using before. The problem was they aren't showing up.

The question I'm asking boils down to, "How do I get back to the original brush tool that doesn't do anything fancy? or How do I cycle through the different brush types?"

Any help would be massively helpful!

Thanks

click on brush arrow upper left corner >a drop down shows up, click on the pointing> arrow to left of box upper corner right side, another box drops >click reset tool