Hi,
I wolud buy some sortiments, they are usual very practical and relative cheap.
You must decide, will you work with THT or SMD & what kind of power /voltage ratings?
Passves as sortiment to buy isnt a problem, at semiconductors is more complex.
I think the good way can be to buy som typical components as OpAmps/FETs & Transistors, adjustable regulators for "labor stock" and rest for concrete needs...
Dont forget some experiment boards, test instruments & pwr supplys + osciloscope-generator ecc.
K.