The best way is quite a broad area, but I think that anyone who wants to be a serious cryptocurrency investor should do things according to some logical order.
To begin with, everyone should learn some basic things such as types of crypto wallets, the differences between a public coin address and a private key, safe storage of private keys and the basics of protecting them from malicious software and people.
After we understand the most important things, the logical step would be to determine the amount of money that we will invest, and this should never be money that we need in our daily life or life savings. Never invest something you are not ready to lose, because no matter how ugly it sounds, everything you invest is under various risks at all times.
Safe storage is something that we need to ensure without delay before we buy cryptocurrencies, which means that we will buy a hardware wallet that meets our needs and that is, if possible, open source. This is where we will keep all our cryptocurrencies that we buy, and we will also make several copies of our backups (seed words) and store them in several safe places.
Last but not least - we will not talk about our investments to friends and acquaintances, and especially we will not write about it on social networks. Bad people are all around us, and if you are careless, you will become a target, whether it is an online attack or even worse, a physical one.
Be smart and careful, because that's the only way to succeed.