OPERATING SYSTEMS vs. BROWSERS
Where different operating systems are concerned, note that the same personal database software may be available for both Windows and MacOS. To transfer data between these OS, just install the appropriate version of the software. e.g. Ancestral Quest for Mac will use data from Ancestral Quest for Windows. Or use GEDCOM to export the data from one program and import into the other. [This paragraph has good general information but may be slightly off topic.]
Web-based products have the advantage of working with almost any operating system, whether you have heard of it before or not. The browser is crucial, the OS, not so much!
You want to use Firefox in Linux Mint or Ubuntu? No problem!
Or you prefer Chrome in Android or iOS? Great!
But you want to use some unknown browser on Windows 10? Hmmm… maybe try Chrome, Firefox, or Edge instead!