There is one very important and useful section of the Krita Manual: https://docs.krita.org/en/user_manual/introduction_from_other_software.html - it presents differences between Krita and other programs (SAI and Photoshop) so their users can quickly adjust to Krita and start working with their full performance.
There are things like different layer stack philosophy, different shortcuts to navigate through the program, features that are in one program and are missing in the other one.
We would love to have more pages like that, for other software. Problem is, we (well, at least I) know Krita very well, but other programs, not so much. If there is any art program you know quite well (yes, even if it’s MS Paint ) and you are willing to take part in writing the manual, please respond under this post. We will help you in this process, you won’t be left alone, especially if you never used Gitlab or similar software.
This post is about specifically Medibang, because I wanted to make it focused. But if you’re reading this and you want to write about a different software, you can respond under this post too. If you know Photoshop or SAI, please write, too, those pages are in a dire need of an update. If someone already responded about a software you want to write about, don’t hesitate to write about it anyway - it’s even better if the work is divided.