Is it true that you can redeem Xbox credit in the Microsoft Store for PC and buy things with it?

I would like to use it to get Minecraft for PC

Yes you can redeem Xbox credit in the Microsoft Store.

Mind you, "Xbox" is a brand or a company of Microsoft, or the whole thing belongs to Microsoft, which simply means that there are no compatibility problems between these platforms.

You can pay with Microsoft credit in the Xbox Store. But you can also pay with Xbox credit in Microsoft.

I hope I was able to help you and I wish you a pleasant day.