How I started.
Once upon a time there was this magical kingdom called Radio Shack. But it's people left the Earth and went to Capacinor - the Unshorted Lands, a place where batteries are always charged and every circuit board has a schematic.
Nowadays there is Pololu, Robotshop, Sparkfun, Adafruit, and Battery Space. Maybe Microcenter, Ebay, and Temu.
Microcenter is good if you are in a pinch and want to quickly grab a Raspberry Pi. +1 for Robotshop too! Pololu is way underrated and has the fastest shipping I’ve ever seen.
Nowadays there is Pololu, Robotshop, Sparkfun, Adafruit, and Battery Space. Maybe Microcenter, Ebay, and Temu.