When it comes to easels, there are lots of choices. In class, some students like a table top easel. The angle can help prevent light from glaring off the painting, but it is very optional. It’s almost as convenient to just put a paper towel roll under the top of the painting to give it a tilt. In my studio, I have a wooden standing easel, plus several styles of table top easels. Here’s a link to the most comprehensive article I have seen about easel types: Different Types of Painting Easels for Artists – by Artpromotivate.