wipe out all docker files to gain back hdd space

Warning: Use only if you understand in full what and why you actually need this:

docker stop $(docker ps -q)
docker system prune --volumes

On mobile security - prepare in advance to report your stolen or lost phone if that ever happens

Open your phone app and "call" *#06#

Once you type the last sharp sign you will get important data that uniquely identifies your phone.

Make sure to keep a screenshot of that screen handy to share with authorities in case you lose your phone.