I'm sure all the information sources I know about have already been mentioned. I will instead share a few simple things I wish somebody had told me: 1. Don't s

I'm sure all the information sources I know about have already been mentioned. I will instead share a few simple things I wish somebody had told me: 1. Don't stock up on components at the beginning. Only buy components that you need to build a chosen/designed circuit. Passive assortments contain useless stuff like many slightly different values of nanofarad capacitors. They will waste space in your parts storage. 1.1 Always keep your parts organized! 2. Surface mount (components sit on top of circuit board) is not hard. For any thru-hole circuit (components have wires that pass through holes in the circuit board), the surface mount equivalent will be easy to solder. Only the surface mount chips with tons of pins, like 32-bit CPUs, are tricky. Those don't exist in thru-hole. Plus, if you start making PCBs, you won't have to drill holes in them. 3. Classic op amps like the 741 and 358 suck. There are newer cheap op-amps that behave closer to the ideal model. 4. If you want to get into repair, practice desoldering before you desolder anything from an expensive board. It's easy to damage components and board by overheating when struggling to desolder.