How can I put my iCloud email on my Gmail

The following may help: Mail server settings for iCloud email clients - Apple Support

and

https://www.androidcentral.com/how-set-your-icloud-email-account-android

Note that you will need to turn on two-factor authentication for your Apple ID if that is not already on and that you will need to use an app-specific password rather than your usual Apple password. See: Two-factor authentication for Apple ID - Apple Support

and

Using app-specific passwords - Apple Support