I suggest that you should be through mining.
Every 10 minutes a group of prioritised transactions are compiled into a block and are then made into a mathematical puzzle for the miners to solve, once a node (miner) has solved the equation, it is then broadcasted to the network of nodes to verify, and if it is correct then the original node that solved the transaction will be rewarded with a certain amount of that cryptocurrency, it is currently 12.5 BTC (halves every 4 years).

The probability of a miner solving this would be based on his hash rate power and a little bit of luck.

It is virtually impossible to individually profitably mine Bitcoin currently, you would need massive upfront costs to invest in the best mining processors and you also need to take electricity costs into account. Here’s an example of the costs currently associated with mining Bitcoin:

My laptop, which is a gaming laptop that cost around GBP 1,000 has a hash rate of 3.8GH/s, even with free electricity this would only return GBP 0.10 per month… pretty poor ROI.

Of course there are miners which are built purely to mine cryptocurrencies and the best performing miners are currently priced at GBP 3,000 and have a hash rate of around 14 TH/s.

In my opinion, the best and easiest way to earn Bitcoins is earn Bitcoins by accepting them as a means of payment.Secondly,earn free Bitcoins by completing tasks on websites.Thirdly,earn Bitcoins from interest payments.Besides that,earn Bitcoins from mining and through trading.Other than that is earn Bitcoins by getting tipped,so that bitcoins can be as a regular income.

Try Investing in many sites you can earn without doing anything you just need to invest money in there site but it is still risky because of so many fake site scammers and company just find a trusted site to put your bitcoins.

which I know to get bitcoin aside from signature and gambling campaigns is trading and investing. trade and investment requires a lot of capital to get a lot of profits as well. but if you want to get bitcoin for free is by joining in bounty campaign.

You can learn to invest through couple times of trading. As one theory we may know-buy low and sell at the high range, you can invest bitcoin and buy them at the lower price as much as possible. Another way I think would be gambling. It has much more risk than any other ways. And it depends on you, you can lose everything or earn everything at the shorter period.

Withdraw some money from your bank,buy some bitcoins and watch it grow.Always save a part of your income aside to buy some btc.
Investing in ico can also help you raise some enough bitcoins as well.

For me the great way to make or earn bitcoin is when you have a capital great way is to buy bitcoin or invest to it that is the best way and also by joining mining and joining all campaign.

Having a loss in trading is natural and we should get used to that and the best thing that we should really do is to just put our attention in those losses and find the mistakes and take it is a lesson in order for us to become better and always make our mistakes/lessons as a basis in creating decisions to avoid repeating the same mistake that we have been done.

For newbie, the great way to make bitcoin is to invest in mining sites which earning bitcoins. But take note, be aware of the mining sites who are offering that kind of promo.
Some are just taking your trust but in the end they will run your investment.