1) Quickly add a link to an assignment, post etc.
2) Push any website URL to all students in your Google Classroom (that also have the Extension installed) to instantly open that website on their device. Students can also share URLs with teachers using the same method.
The goo.gl extension automatically creates a shortened URL and/or a QR Code for quick reference to any website.
This extension allows you to hover over anything on a website to find the exact colour that has been used.
Within Google Drive (and heaps of other tools) you can then copy and paste the colour code that ColorZilla produces to replicate the exact same colour (see below).
Similar tools, you only need one. Nimbus (left) is easier, looks nicer. Screencastify (right) has better Google Drive integration.