Huawei p9 lite 2017 store?

I have, as shown in the photo, a lot of firmware, cache and others. What is firmware and others, how can I delete them?

Firmware is your operating system on the phone. So in order to be able to use all functions, you absolutely need this software.

I would rather deal with the apps more intensively… Sort something out or delete the cache / data in the background of certain apps in the background to make more space. Almost 10GB is already a lot in this regard.

Possibly. Could you also look, if you can use another SD card or push various data into the cloud.