Get one of these things:
https://www.ebay.com/itm/402564561883?hash=item5dbab7bbdb:g:fDUAAOSw0t9ftLoTIt's a nifty pic-based component tester that tells you what something is, and what leads are what. It does transistors, diodes, capacitors etc. I've had mine for a couple years now, bought direct from China for less money but a longer wait. Bob, W1GWU, the voice of Hosstraders for those who remember back, got one at the same time and they've been flawless. Search on "transistor tester" and there a lots of the same to choose from, but this one is plug and play in an enclosure. Pure magic.
73 de Norm W1ITT
