What do you talk about when texting with friends ?

I have a normal amount of friends but rarely talk to them online just to hang out and other pretty general stuff. I also have friends that live outside of my country that I never text cause I just don’t do it in general.
I want to improve this to keep my friends “closer” but I find myself cloudless on what people talk about online like what should I do? Just like text them saying hello I saw you yesterday but wanted to know how where you ? Idk I feel like I am a 60years old trying to understand how people interact online 😭😭
I live in Italy idk if it changes something also I wanna add that I regularly go out and I don’t text my close friends too, it’s not a question for me to increase my social circle just to “keep more in touch”