When I started out in Electronics and was building things there really were not any Surface Mount Devices. I had a basic understanding of the basic packages for most of the common components.
I used to make PCB’s with rub down transfers or by drawing with etch resistant pen. Most boards were either single or double sided.
I have not even attempted to make a progect using SMD components. Simply sourcing and attempting to replace SMD seems way more complicated then way back when.
I spotted this little ruler while shopping for parts and figured it would at least help me to identify package types a bit easier.