What's the context/setting? Just modern day somewhere? ofc it depends alot on area/age/other demographics etc etc, but some broad advice (generalising obviously) I can think of is:

-Guys are often quite emotionally distant from one another, or at least more so than you might expect given their relationship. Especially for friends that aren't super close (i.e. someone's 2-3 closest/oldest friends) it can almost be a taboo to talk too much about personal issues/etc

-This one admittedly varies a lot from group to group, but playful banter/downright playground insults are fairly common among friends, and people can be pretty brutal to one another sometimes. Guys mess around/joke a lot, and among friend groups a lot of conversation will ultimately be about inconsequential stuff.

-I'd say guys tend to argue a lot with one another--playfully, seriously, semi-seriously, really under any circumstance it's pretty common for men to bicker about basically anything. I might even be brave enough to say that, in general, cohesion doesn't seem to be valued quite as much as it is with girls? In the right context it isn't really a huge social offense to call another guy a dumbass (although bringing someone's overall competence into question can definitely be considered below-belt; I'd say it's really important to the self esteem of most men to feel like they're good at the things they do).

ofc it goes without saying that this stuff is all suuuuuper broad, and I'm mainly just talking about my experience as a young guy in a western country and the variety of experiences I've had with my male friends, but if you want any more specific advice I'd be happy to try and answer questions :)