u/Aecnoril

I've seen some posts talking about flux, but usually they recommend a small tub that sets me back 80 bucks.. I don't plan to do much soldering, but it's fairly delicate work on microboards (ESP, ATTINY and RGB strips) and some repairs on an old stereo. Do I really need expensive fancy flux? Or will my flux core tin be enough. Can I get away with a cheap tub, and if so, what would you recommend? I like in the EU/NL/Utrecht if that helps.