On Planet Labs Github account, you can find many specific examples for using Planet's CLI Tool. It includes examples on searching data, such as creating saved searches and using files for searching data.
You can also find examples on finding Mosaics, downloading Mosaics, and getting information on Mosaics. Furthermore there are examples on ordering data via CLI, including using toolchains and setting delivery details. Lastly, there are examples for all Analytic feeds, subscriptions, or collections you have access to - this is a more specific product that has to be purchased separately.