How to get code from my computer to my PinePhone

[wibble]

thanks
So, if I want to save data on my phone do I need to mounted also in write mode?

Generally, no. UBPorts puts user data on a separate writeable partition, and that's all you're meant to need to write to. Installing apps via apt isn't something you're meant to be doing, but with a few extra steps it can be made to work if you really want to. It's a different arrangement to the usual linux installations. They've probably got some documentation about why they decided to structure it the way they did somewhere on their site.