You earn bitcoin the same way you earn fiat: you must work for it or provide some sort of service . I don't understand why people think bitcoin is free money.

If you want to get started with your first BTCs, join a signature campaign, it's useful to get some without having to buy them, then you can test it out. Faucets are pretty useless nowadays so sig campaigns are the best for noobs.

Of course it's possible to earn Bitcoin without Investing fiat money but you will have to put more efforts. Besides signature campaign one of the best way is to perform different jobs for Bitcoins. If you have some special skills and knowledge that shouldn't be very hard, people always need products and services. But remember, no pain, no gain, Bitcoins will not fall from the sky to you.

You can try 21.co. By signing up and do a few tasks, you should about able to get a dollar or so worth of bitcoin. However, you will need to link the account to your facebook or linkedin account, to prove that you are a real person.

If you have a graphic design skill or programming skills, Try to apply to an ICO team instead of participating campaigns. It will surely give you high salary and at the same time you will practice your skills but you don't have any skill that related to crypto then follow the suggestion above. It is the best possible way to earn BTC without investment of fiat.

Yes you can. But its same like earning fiat than, or harder actually.
You have to work hard and earn it, if you have skills, you can provide your services and earn bitcoin. If you have something to sell, you can sell it for bitcoin.
But if you think you'll only accumulate with micro earnings and signature campaigns and other similar stuff online, then you're earning will be very slow. You'll be spending year(s) even accumulating your first bitcoin with its current price.
So suit yourself, buy if you can, and if you cannot or don't want to, then work hard and smart.

There are many ways to earn cryptos without investing money out of your pocket and still you can make big. However, initially you will have to start with small amount. Try to provide service if you are good in coding or try joining a signature campaign. It will give you a kick start into crypto world.

Do it for few months and accumulate all what you are earning from these methods. Once you have some decent amount of funds accumulated in your crypto account, you can start trading with it. Initially, you can start with small amount of money to learn trading and one you are comfortable with it, increase the value of trade. It will help you to earn big. This is exactly how I started.

My thoughts are that you should read more and type less.  Much less.  The "4u" part of your username indicates that you're some Asian that probably can't read, but try anyway.  This forum is clogged with topics startedby illiterate fools.  You'll find your answer in some other thread that someone else started,  I guarantee it.

Don't join a sig campaign.   Leave that to intelligent folks who are ranked higher on this forum.  Buy bitcoin with what you earn in real life.

are you for real?
is 1 hour of your life worth only $0.02? the cost of internet and the electricity cost that your computer is using is so much higher than what you earn!
not to mention wasting your time

I dont think that this is thee only way to earn money with Bitcoin. There are thousands of jobs over there and you can do as much as you want if you have enough talents and skill.

If the faucet pays out too often, then Option 2 doesn't actually earn you any money at all.  It's a scam.

Each payment that you receive will require 148 bytes in a transaction when you want to spend it later.

According to https://bitcoinfees.21.co/  the current recommended transaction fee for fast confirmation is 0.00000220 BTC per byte.

So, if you want to spend a 0.0000125 BTC (12.5 micro-bitcoin) payment that you previously received, it will cost you:
148 bytes X 0.00000220 BTC per byte = 0.00032560 BTC (325.6 micro-bitcoin) in transaction fees.

You'll have to add 313.1 micro-bitcoin of your own money just to spend that 12.5 micro-bitcoin from the faucet.

In other words, faucets don't earn you money.  They cost you money, but they hide that cost in a way that you don't easily see.  It isn't just a waste of time, it's a waste of money too.