With this guide I'll try to help describe for beginners why operating voltage and logic levels matter, and how you can decide which to incorporate in your project. When I first started working with these, I didn't really understand why it mattered and kind of just decided, "I'll just use all 5V and pretend 3.3V doesn't exist." I very soon found out that I couldn't just ignore 3.3V.
Usually, you'll see 5 volts and 3.3 volts (also marked 3V3 in schematics) indicated somewhere on these boards. If you work with electronics, be it microcontrollers like an Arduino Nano or SBCs (single board computer) like a Raspberry Pi, you've surely noticed that there is more than one voltage level marked on these boards.
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