I’ve seen videos of surface mount IC soldering using flux. I have no idea what exact flux pen or applicator to use. Here is a list:
My board and solder are both lead free. What I saw as a small brush with flux on it and another type is a syringe. Maybe chipquik?
Several types of flux such as no-clean, etc. also confuse me. What do you use? Can you recommend one for me? Thanks.