Years ago I used to use Microsoft office, I have never used any Google application for this, but clearly Microsoft was not an option either and years ago when I decided to change all my software to open source projects one of the first things I had to change was my office suite, luckily there are many good alternatives, the first one I tried was Onlyoffice (https://www.onlyoffice.com/), a quite complete suit and with a very good compatibility with Microsoft documents and although it had some problems with the spanish spelling corrections, the software worked quite well and I was using it for a while, until I switched to linux, I am currently using Linux Mint and I will talk about it later, but Mint already comes with Libre Office (https://www.libreoffice.org/) installed by default so I thought ´why install another software if I already have this one` so I decided to start using libre office and I think it was a good choice, so far Libre Office has worked great for me, the spell check works very well, the interface is easy to use and very intuitive and you won`t miss Microsoft at all, you can open all types of documents and is completely free and open source, the only complaint I have would be that there is no version of this for android, however on my phone I use Collabora Office (https://www.collaboraoffice.com) a pretty good project that Libre office recommends on its website and with which so far I have no complaints either, although its running a little slow and I don't know why.
Using open source office has been quite simple, projects like libre office are quite complete and easy to use, for example these posts I write in libre office before publishing them here, coming installed Libre office in linux mint saved me a lot of work and made me try an excellent software that probably I would not have tried before.