The best way to earn bitcoins without any investment is by joining signature and bounty campaign where you will get paid fixed amount of bitcoins depending on your rank and once you have earned you can start investing those bitcoins in different altcoins to increase the level of your coins in quick time and if you have any specific skills then you can offer your services on this forum and can receive payment in bitcoins.
Yes this is for if you have a high rank like you. Who have put time in bitcointalk mostly for money instead of doing other things. If you are a beginner you should claim from faucets thats what i also did.
It gives you bitcoin every day it would be wise to do this so you can have a little bit bitcoin. With this you can understand what bitcoin is and how you can do things with it.