Flux generates the visible fumes seen during soldering. Exposure to rosin can cause eye, throat and lung irritation, nose bleeds and headaches. Repeated exposure can cause respiratory and skin sensitisation, causing and aggravating asthma. Rosin is a serious occupational health hazard.
But Fume extractor are really expensive like 70$ which beginner like to skip because of the price.
In this instructable, I will share what I used for so many years.This project cost around 5$ but works like a charm.