It depends if you want to earn free Bitcoin or invest into it. If you want to earn free Bitcoin, there are a lots of faucets, giveaways etc.. I do not believe in making money by this type because faucets are paying nearly nothing, giveaways are fake.. or chance to win is really small.
To invest in Bitcoin you can for example use Coinbase - it is the best for newcomers to crypto world. You can easily deposit your real money and buy Bitcoin - Ethereum - Litecoin. After purchase just hold you coin and sell later for profit when coin increases its value. I would not recommend Coinbase while they have high fees. Better way to invest into Bitcoin is to use any exchange where you can trade fiat money for BTC. For example Bitstamp (there are lots of them but Bitstamp came first to my mind). Register there, transfer money via your Bank account. Then make easy purchase and hold till moon
or sell when value is up and buy again when there is dip. Look at the chart now and you will see that Bitcoin had price drop yesterday, you might consider buying it. 
To invest in Bitcoin you can for example use Coinbase - it is the best for newcomers to crypto world. You can easily deposit your real money and buy Bitcoin - Ethereum - Litecoin. After purchase just hold you coin and sell later for profit when coin increases its value. I would not recommend Coinbase while they have high fees. Better way to invest into Bitcoin is to use any exchange where you can trade fiat money for BTC. For example Bitstamp (there are lots of them but Bitstamp came first to my mind). Register there, transfer money via your Bank account. Then make easy purchase and hold till moon
or sell when value is up and buy again when there is dip. Look at the chart now and you will see that Bitcoin had price drop yesterday, you might consider buying it.