Most here will recommend Linux Mint and it's what I use now after trying many different versions over the years. There's a simplicity to Mint that just works especially well for those just surfing and doing office tasks. I've given away old work laptops with just mint installed as most people just need a web browser and it works great for that.

MS office can be used in your web browser or you can switch to Libre Office which should open most of your office files.

If you have a old laptop or computer I recommend trying to install Mint there first to try it out. It's pretty easy to start out there first before trying dual boot. You might be surprised at how quick your older laptop works with Mint in the process.

I use dual boot on my machines but most of the use these days is to get to a web browser so I find I rarely boot into windows now.

You will find Firefox is the default web browser but you can add Chrome to Mint if that's your browser of choice.

Many will say what about the privacy issues with Chrome but many still use it. I've switched back to Firefox myself and I like it better for my Android phone.

Good luck on your journey!