Yes right, if we are new to bitcoin better we collect bitcoin without investment and look for it for free for example various campaign in this forum. I also like to follow the campaign program and proven to earn earnings.

The best way to get bitcoin without investing is to sell goods or services, you can get a good amount of bitcoin if you have the goods or services offered.
But if you do not have it then you can join a signature campaign here in bitcointalk and start earning bitcoins for free. Another way is to join a paid site to click but not much income if you do not have many referrals.

Rank up in this forum and participate in signature campaigns, these pay you to be active in this forum.
You can also do social media campaigns, translate a whitepaper, write a blog, ...
Another way to earn bitcoin is doing faucets, low reward but a good starting point to learn about bitcoin and other coins

There's a lot of ways to earn bitcoins. You can try to join in signatures campaign were you may earn bitcoin. but it takes time to do it and if you had already bitcoin you may invest in some programs, or if you want learn how to trade coins. You may earn a lot from it. You may be rich in few more years.

You can earn bitcoin without investment all you need to do is rank up your account and you can see you can a good amount then join in a signature campaign with a good feedback.

yes by following a bounty champaign can get a gift from ico developer
if it has already completed the task given in accordance with the rules

Earn bitcoin without investment:

• Work for bitcoin as a programmer, designer, artist, writer, translator. Find jobs in the Services topic: bitcointalk.org/index.php?board=52.0 or check XBTFreelancer andr/Jobs4Bitcoins
• Signature, social media, advertising campaigns (check Services topic)
• Mine altcoins with CPU (you need ASIC to mine bitcoin): cpucoinlist.com Then convert altcoins to bitcoin with Shapeshift
• Write articles and blog posts for Steemit. Payment in STEEM (altcoin) depends on amount of views and votes. Then convert STEEM to bitcoin.
• Earn bitcoin with ads, e.g. a-ads, mellowads
• If you have an online store, accept bitcoin as a payment option: e.g. CoinPayments API

There's a lot of way to earn bitcoin, but as of now the best way I know & I do is joining signature campaigns. This may help you earn bitcoin buy working for a campaign. It is the easiest way I know. There are campaigns who'll pay you in just a week,  but there are also campaign that will pay you after the campaign. The longer one is much better for me, because this gives larger amount rather than weekly salary.

You have to remember when you spend your time to wait something, it usually gives you a benefit higher than others can not wait it. Bitcoin also a best example for my said. From 2009 till today, if you can hold your Bitcoin, you will have many profits and do not need to work hard as now

If you need to earn bitcoins without an investment,then joining in a signature campaign would be the right choice as you have to only post here and receive your bitcoins weekly.Zero investment.

Also,you could join faucet sites,but the income will be comparatively low and it would be a total waste of time.

You could mine some altcoins which support CPU or GPU mining in system or laptop.But there is a huge risk of your laptop's mother board getting damaged.