Cane users advice please!

Context: in my country, you can buy a cane without a prescription. All pharmacies sell them, and some people even buy them for "aesthetic" reasons.

I recently got a friend a cane. I found a nice one, retractable kind with a T shaped handle, for free, and remembered that specific friend talked about wanting one due to back issues. Long story short, they got it, adjusted the size with the help of their doctor, and they've been loving the extra support. That being said, we are both new to this stuff, so here are my questions :

Is there anything we need to know about how to take care of a cane?

How do I make sure I give my friend the right amount of space when walking together? (We kinda got used to it but sometimes it's a little awkward still.)

Do you have any other advice for me? I want to support my friend. Thanks in advance.