Get approximate IP details.
Find A, AAAA, CNAME, MX, NS, TXT, SOA DNS records of a host.
Get all possible details about an SSL certificate.
Get all possible details about a domain name.
Ping a website, server or port..
Compress and optimize images for a smaller image size but still high quality.
Extract email addresses from any kind of text content.
Take an IP and try to look for the domain/host associated with it.
Make sure your passwords are good enough.