She explains Cloud Storage Providers in the best way possible. Visit YouTube
I’m pretty sure if you follow her, she can teach you a lot.
Below we will explain it to you how you can encrypt basically any file or folder before sending it to any cloud storage providers such as MEGA, Google or OneDrive.

We’re going to use cryptomator

Click Download Now
Follow the installation dialog box
Click Add Vault

Create New Vault
Choose any Name
Choose your preferred folder
Click Next
Click Create Vault

Upload those files to Cloud Storage Provide
They wont be able to see a single thing.

Curious about what cloud storage provider can see?
look at the image below

This is what they will see.

U can use WinRAR to set password for any file you believe requires security and privacy.

Install WINRAR
Select the file u want to protect
Select Add to archive

Select Set Password

Enter Your Password
Click OK

Now no one can see inside your rar or zip file except the ones who hold the keys.