Office 365 is a widely used suite of programmes and apps. It is also used to log in to various services and resources. It is free to students of most UK universities.
Download Office 365
If you don't have the university email address, you can start using it with month-long trial access. Do not pay for Office 365.
Once you have the university email address and password, open any O365 programme on your computer and add these details to the O365 account. This will activate your free licence.
Go to the App Store (for iOS) or Google Play (for Android) and search for the apps you want, e.g. Word, Outlook, OneNote etc. Install and login with your university email address.