As a very occasional solderer, one thing I don't see written about much in beginner guides is ventilation. With lead-based solder, I'm never sure what I should be doing, especially in a small room/workshop. Keeping windows open or having good airflow isn't always possible. Things like: should I avoid leaning over or breathing in while leaning over something I'm soldering? Do I need to air the room afterwards? Would a…
However, when soldering you will end up with little balls and blobs of solder as waste. Don't just throw them in the trash. These should be collected and disposed of properly, as hazardous waste so that they don't end up in a landfill polluting your grandkids' water supply.