Just talk it out. Be honest about how you feel and listen to what they have to say. For example, if you're mad about them being late all the time, tell them calmly and hear their side too.
Jealousy is a common one. For example, if one friend gets a new job or a new relationship and the other feels left out or jealous. Another is miscommunication, like when messages are not clearly conveyed. Also, borrowing things and not returning them in good condition can lead to fights.
I know of a best friend fight that happened because of a missed birthday party. One friend had planned a big party and the other friend didn't show up without any notice. The one who threw the party felt really hurt and betrayed. They fought for days. But then the friend who missed the party explained that there was a family emergency. After that, they forgave each other and their friendship became even stronger.
They can start by having an honest conversation. Just sit down and talk about what went wrong and how they each felt. For example, say sorry if they were in the wrong.
Sure. Once I had a fight with my best friend over a small thing. We both liked the same book in the library and wanted to borrow it at the same time. I got angry and said some mean words. Later, I realized how stupid I was. I apologized and we made up.
One story is about two best friends, Tom and Jerry (not the cartoon characters). They met in college. Jerry was out as gay but Tom was still figuring himself out. Jerry was always there for Tom, helping him with his studies and in his personal growth. Eventually, Tom realized he was also gay. Their friendship grew even stronger as they supported each other in coming out to their families and facing the world together. It's a story of true friendship that overcame many obstacles.
A big challenge is when the best friend has different beliefs or values regarding homosexuality. For instance, if the straight best friend comes from a very conservative family, they might struggle with fully accepting their gay friend at first. There could be internal conflicts. And in some cases, the gay friend might feel that his best friend is not as supportive as he should be, leading to misunderstandings and potential rifts in their friendship.
One of my best friend critic stories was when my friend told me my new haircut didn't suit me at all. At first, I was a bit offended, but then I realized she was just being honest. It made me think twice before getting that style again.
There are many. For example, two best friends who grew up together in a small town. One of them had a dream to become an artist but was too shy to show his works. The other friend organized an art show in their local community center, inviting all the neighbors. It was a huge success and gave the first friend the confidence to pursue his art career further.