I did my learning process trough my mobile device with help of "termux app" and "spck editor app".
"Termux" for git stuff.
And "spck" for reviewing the site.
it get's the jobs "done" but switching app on qualcomm 4xx series was a pain.
My old laptop cpu is fried
(silly me for keep pushing it to the limit by doing a lot of distro hopping and building my phone kernel from source)
And my main phone (poco f1) is suddenly dead.
I really need to buy a new laptop. 
Last time when i using Nano i remember is ctrl+o => enter=> ctrl+x ;
on cellphone how you manage that? 🙂
@Sphinx oh. Forgot to mention. To access ctrl button it's either using the 2 row virtual key. Or using a vol down button. 
Thank you for your reply, have a nice weekend!
@Sphinx you too sphinx you too. 
@Sphinx same as using desktop but with limited visibility