Microsoft 365 (Office) applications can be installed locally on our computers, as most of us are accustomed to. They can also be utilized directly in a web browser - no install required!
From the M365 Portal (https://portal.office.com/) select the App Launcher (9 dots at the top right) to select the appropriate application.
Save to your OneDrive for access to the files from any computer resource, including your primary desktop/laptop PC.
Accessing M365 files from SharePoint or Teams will often open within a browser session.
Collaboration and co-worker access is made simpler by editing the documents where they are hosted, rather than save a local copy and upload it manually.