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.
Yes you are right we need to study and learn more about investing specially the beginners or new in investing like me first thing i do when i want to invest my money and we all know that the all investor has only one goal that is to gain a profit from it. I really take time to study what will happen when I invest my money or how huge the risk will i take when i invest but think twice before you invest study the coin and see the chart and if you that that the value of coins that you wanted to invest is dump then go dont missed the chance and hodl it for long or short term