You can use user accounts on the computer's operating system to achieve this.
How to share a computer
Each person can have their own user account with separate login credentials, files, and settings. This allows multiple users to share the same computer while maintaining their individual preferences and privacy.
Additionally, cloud storage services like Goo gle Drive, Dropbox, or OneDrive enable users to store files online, accessible from any device, ensuring personal files are accessible regardless of the computer being used.