"Best" depends on who you are. I suggest just jumping in and starting. Find a real problem and build something to address it. Make yourself an audio amplifier o

"Best" depends on who you are. I suggest just jumping in and starting. Find a real problem and build something to address it. Make yourself an audio amplifier or Arduino robot. Start fiddling with blinkylight GPIO on a raspberry pi. Build a one wheel skateboard. you might find ideas here: https://hackaday.com/blog/ https://hackaday.com/blog/