There's a lot of things you need to consider that if you don't give importance your investment may be at risk so here are some of the things ou need to consider or to study.
Learn about the basics first such as:
Bitcoin wallets
How Bitcoin works
What is Blockchain
Types of wallet
And different kinds of investments
Second Learn what kind of investments you need to do, here are:
Trading
Holding
When you've decided what kind of investment you're going to do start finding exchange where you will bought your first bitcoin there's a lot of platforms where you can buy bitcoins such as:
LocalBitcoins
Binance
Coinbase
Just search on the internet.
NOTE: You should know the risk you're going to face when it comes to investment remember that there's no assurance that if you invest you're going to earn so invest only what you can afford to lose.
Although there is so many means and ways to actually invest in it; I agree that it's just difficult to be in this market, and that is the very reason why so many people have already prompted to quit in venturing in this market simply because of the risky and uncertainties that come with it. It's hard to analytically try on something that you know has so many alleys to make you lose your investment and get your capital down the drain. So, if a person is really serious in this market, aside from he has to accept the fact that it's a risky market, he has to deal with his ventures with utmost care and patience.