However, if your childhood is a particularly unreliable person and his project is also a particularly unreliable project, you must not do such a thing. Between friends, friendship belongs to friendship, the law of interests. If he simply borrows money from you, you can lend it to him, but if you are allowed to invest, you must not invest in unreliable people, and you must clearly divide the interests.
As long as interests are involved between friends, the friendship between two people will become particularly sensitive, so if you want to make your friendship simple and pure, you'd better not interfere in such things. Many friends with very good feelings have become enemies because of doing business together, so you must think carefully.
But if two people are very good friends, they can talk about everything and won't haggle over every ounce because of a little petty. I believe that such a friend will not harm you. As long as the project is reliable, you can cooperate with him. All in all, it depends on whether it is reliable or not.
In the world of adults, there is such a hidden rule. If someone knows the way to get rich, but he is willing to tell you, either his relationship with you has reached such a point, or he can earn more money from you. You know, there is nothing good in the sky, so you must think carefully.