There are two ways to get bitcoin-
BUY- Buy bitcoins from the best exchanges who offer best rates and also are reliable.
Earn- You can earn lot of bitcoins through mining. Though solo mining is not profitable hence, people are opting cloud mining which not only makes you financially free but also, helps your near and dear ones in earning passive incomes. But, beware of the scams emerging every day.
Earning bitcoin is the best source because it is more challenging than just buying bitcoin, well if you can buy then that is good because you can easily increase your investment and we know it will bring good profit in the future. As far as my analysis is concern I already consider it the best investment despite the fact that it is very risky but I have a big hope it will bring me some good money in the future.