Accumulation of Knowledge
The signal-to-noise ratio on Discord and the forums is rather low. To prevent user frustration and ensure the information remains useful, we'll be using this wiki to collect said information.
Table of contents
Here you'll find recommendations from the course facilitators as well as the participants for tools and supplies that they use on a regular basis. Please note that the Amazon links (and most of the clickable images) are affiliate links that will benefit TeachMePCB.
Soldering Stuff 
Replacement tips: None for now... the one I just tested won't hold temperature, as claimed by some Amazon comments. Will be doing research.
Meters and Testers 
SMD testing tweezers:
Other tools 
Printable "stick-vise" board holder: https://www.thingiverse.com/thing:2933056