If you'll rely on those free bitcoin websites like faucets, you already have an idea of how they would go. You'll be mostly wasting your time with faucets and those captchas and whatsoever where they'll be giving a few satoshis. I've been there and done that, it's fun while it lasts but you may still try it but one thing for sure is that you'll be exerting effort to earn it. It's the same as earning from employment for which you have exerted effort working the whole day and you'll get paid for your time and effort. The same goes for earning with "free" bitcoin, there's an exchange for you to earn that. And another one is working with companies that will pay you in BTC, there are too many marketplaces where those jobs, positions and tasks are available.