Thank you for answering back to me, @pmciano.
This means that if I purchase the domain, the development mode will not be enabled?
And the communication problem: your site cannot communicate properly with Jetpack will go away?
Yes, I want my site to be available online too, But it seems that self-hosting have many steps to do, compared to purchasing hosting packages. Sorry, I am new to these options. I am currently a freelancer, so I am kind of pinching pennies here.
I hope this is clear enough for you to understand…
