amateur

A lover of something.

he conducted extensive correspondence on wines with European suppliers, employing a wine vocabulary familiar to any modern amateur of wines.

A person attached to a particular pursuit, study, science, or art (such as music or painting), especially one who cultivates any study, interest, taste, or attachment without engaging in it professionally.

The contest is only open to amateurs.

Someone who is unqualified or insufficiently skillful.

The entire thing was built by some amateurs with screwdrivers and plywood.

Non-professional.

Created, done, or populated by amateurs or non-professionals.

amateur sports

Showing a lack of professionalism, experience or talent.

Duct tape is a sure sign of amateur workmanship.