Tracking your collection
The Discogs website / App is THE standard for finding out everything you need to know about the record in your hand.
You can get a free account and track your collection - very handy once it gets large and you can't 100% remember if you have an album already!
.The phone app is also handy when buying records to make sure you're not being ripped off, or are definitely getting a bargain.
Some people also keep a separate Excel/Sheets version as a backup, in case something happens with doscogs or their account.