A group of Microsoft Products and technologies used for sharing and managing content, knowledge, and applications.
Currently the best option is to take the route of Microsoft 365 paths, like you say, everyone works with M365, I recommend you to follow the Microsoft 365 training and certifications
then you can follow the next topics for M365 https://learn.microsoft.com/en-us/learn/m365/ and also the documentation for SharePoint Online https://learn.microsoft.com/en-us/sharepoint/
Please fell free to contact me, it will be a pleasure to help you
Kind regards