PLA filament is easy to 3D print, and can be used for many applications. It is beginner friendly, but also great for the pro. A biodegradable and bioderived polymer, it doesn't require a heated bed. Protomaker offers many different color options, and two different strength options.
For parts that are lightly loaded use the economical Basic PLA.
For parts that need higher toughness and layer adhesion use Tough PLA.