Here's a list of command line tips that I've found useful over the years.
Linux Command Line
Page status (http status code):
curl -I website.com
IP of remote site:
dig +short website.com
Here's one for placing a 'shortcut' from one file to another. Useful for keeping configuration files standard. I can put a config file in Dropbox/Nextcloud and refer to it on any machine I'm using.
ln -s real_file shortcut_name
List files with details:
Find out where your disk space is going:
du -a (directory) | sort -n -r | head -n 10
This estimates size, sorts the results, and returns the top 10