I have been using One Drive on my laptop and purchased a new desktop PC and have just installed the One Drive app on the new desktop too. I want to be able to work on documents across both devices and also have copies of the documents saved on each device (as well as backed-up on One Drive). I use Windows 11 Home on both devices.
The easiest way is to store your documents in your OneDrive, instead of storing them on your computers' hard drives. When you do this, you can work on your documents from any computer in the world.
When you store your documents in your OneDrive, you can use the online version of Microsoft 365. I will admit that the online version doesn't yet have all the features of the downloaded version of Microsoft 365, but it's getting closer all the time. The online version of M365 (that is included with your subscription) is impressive, and it may have all the features that you really need. You can still use the downloaded version of Microsoft 365 on files stored in your OneDrive, if that's what you prefer.
This is what we mean by the term 'cloud computing', i.e., storing your files in the cloud and working on your files with online apps. This is the way Google's software has always worked, and this is the direction where Microsoft is going with its software. The whole idea behind the OneDrive app is to help Microsoft's customers transition to the cloud.
My only goal here was to introduce this alternative and explain how it works. You should do whatever works best for you. But it's nice not to have to worry about where you stored your documents or keeping things in sync. I wish you the best of success.