This video is from 2011, but I think it's still good general advice. It might be overwhelming to think about everything he recommends anyway.
In my case, I don't do electronics repairs on a daily basis and I'm not an expert. I spent more that 10 years considering if I should buy a Fluke multimeter or a Hakko soldering iron and a desoldering gun.
Long story short I ended up buying a lot of good tools over a long period of time and I'm very happy I did.
My advice: start small and upgrade to better quality tools over time.
Learn how to maintain your soldering iron tip.--> VERY Important!
I used to clean the iron tip with a wet sponge for many years, but now I use a copper wire ball and I find it much better. Tin the tip after every use. Buy good solder (Kester, MG Chemicals) and flux.
Don't use your soldering iron to open holes on plastic (or anything).
This guy is extremely knowledgeable:
How To Solder Properly:
How To Desolder Electronic Parts Using Different Tools:
This guy has some interesting review videos too:
Get a magnifier, something like this:
https://www.amazon.com/YOCTOSUN-Rechargeable- … ps%2C181&sr=8-2
Get a good microscope if you can: https://www.aliexpress.com/item/32950524594.h … .7d8c2e0e7VbUST
(I don't have one yet, It's on my wish list.I don't know if that's the best for the price)