Questions & Answers about Положи соль и перец на стол, пожалуйста.
- Положи comes from perfective положи́ть and asks for one completed action (put it down once).
- Клади is the imperative of imperfective класть and focuses on the process or repetition (e.g., ongoing instructions or habitual action).
In everyday single requests like this, положи is the default.