Yes this is one of the best golden rule for people who plans to invest on crypto.
Though for me you must learn first before you invest, I suggest you to read all pinned post in this forum and you must know all the rule's. Then read many topics about what you want/need to know, you can learn how to invest on the right coin's to lessen the chance of loss in the future, this community will help you a lot in term's of cryptocurrency.