The remember Multi-Factor Authentication feature for devices and browsers that are trusted by the user is a free feature for all Multi-Factor Authentication users. Users can bypass subsequent verifications for a specified number of days, after they've successfully signed-in to a device by using Multi-Factor Authentication. The feature enhances usability by minimizing the number of times a user has to perform two-step verification on the same device.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/authentication/howto-mfa-mfasettings

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Explanation:
A DLP policy can be configured to allow users to override a policy tip and report a false positive.
You can educate your users about DLP policies and help them remain compliant without blocking their work.
For example, if a user tries to share a document containing sensitive information, a DLP policy can both send them an email notification and show them a policy tip in the context of the document library that allows them to override the policy if they have a business justification. The same policy tips also appear in Outlook on the web, Outlook, Excel, PowerPoint, and Word.
If you find that users are incorrectly marking content as false positive and bypassing the DLP policy, you can configure the policy to not allow user overrides.
Reference:
https://docs.microsoft.com/en-us/office365/securitycompliance/data-loss-prevention-policies

Explanation:
The users are assigned SharePoint licenses directly. Their group memberships have no effect on licenses directly assigned to the user accounts.

Members of your compliance team who will create retention labels need permissions to the Security & Compliance Center. By default, your tenant admin has access to this location and can give compliance officers and other people access to the Security & Compliance Center, without giving them all of the permissions of a tenant admin. To do this, we recommend that you go to the Permissions page of the Security & Compliance Center, edit the Compliance Administrator role group, and add members to that role group.
Reference:
https://docs.microsoft.com/en-us/microsoft-365/compliance/labels#permissions

During Project1, some users will have mailboxes in Microsoft 365 and some users will have mailboxes in Exchange on-premises. To enable users be able to exchange email messages successfully during Project1 by using their current email address, we'll need to configure hybrid Exchange.
To migrate mailboxes in a hybrid Exchange configuration, you use Exchange admin center perform Remote move migrations.
Reference:
https://docs.microsoft.com/en-us/exchange/hybrid-deployment/move-mailboxes