There are three brackets that are widely used for making shelving. These are: wooden brackets fixed to vertical battens, L shaped metal brackets fixed to the wall studs and metal brackets that clip into slotted metal strips fixed to the wall stud.
Wooden brackets ‐ These brackets are a basic three piece triangle construction which is screwed or nailed into the wall. Inexpensive and easy to make.
Metal Brackets ‐ These L shaped metal brackets come in varying sizes, and styles and achieves maximum strength if screwed directly through the wallboard and into the wall stud.
Metal Strips ‐ This system achieves a high weight capacity with vertical metal strips that are screwed directly through the wallboard into the wall studs. The metal strips and brackets come in varying lengths and are very easy to install and adjust.