Here are some of the consumables I use for my projects, i will be moving here any parts i find myself reusing time and again.
solder wire - I use the lead one because it is easier, but with enough skill you should be able to move to lead-free wires
rosin - makes soldering easier
liquid tape - helps to prevent shorting
nozzle socks - I am actually not sure that does anything, but the cool kids put in their mk3s, so faking it until I make it here
cyanoacrylate glue - mistakes happen, and that is the ctrl+z
3:1 heat shrink with glue - look for the one with glue, it is much easier to get it to stick
99% ipa - if I have a secret to get pla to stick to a bed, is this thing
M2 and M2.5 assorted screws - most Raspberry Pi related parts appear to use M2.5, so having a set of assorted short screws comes in handy. I like the dark countersunk flat tops, but any will do.
tip tinner - to keep the solder iron in tip top condition