A saying is that friends are easy to make but hard to keep,do you have any good idea about keeping friends

俗语说,交友容易,但成为长久的朋友难. 如何和朋友长久相处,大家有什么看法?

Yes, maybe the sincere relationship is the most important, I think.

first be friendly and sincere

keeping friend is very important》keeping contact maybe important.