I'm almost always looking for technical stuff, so I go right to the source. StackOverflow, Reddit, arxiv. Best of all is still hyper-specific dedicated forums w

I'm almost always looking for technical stuff, so I go right to the source. StackOverflow, Reddit, arxiv. Best of all is still hyper-specific dedicated forums where they exist. For shopping I use Geizhals, Idealo or huge sellers like Digikey.