increasing followers

Want to know the ever best strategy to increase the followers of new account on instagram without investing so much time and not so much money too. Mod Edit: If you want to buy, post in the WTB section. Please let me know :) Cheers !

Hi everyone,:) I'm new here and i wonder and asked many times how some pages in fb get my like and my follow without my knowledge. They made a huge numbers of followers in no time, can anyone explain this? Thanks,