The mass transfer tool allows you to transfer up to 250 records at a time from one user to another user while keeping the existing team members intact. You can access this tool from Setup by entering Mass Transfer Records in the Quick Find box. References:
https://help.salesforce.com/s/articleView?id=sf.mass_transfer_overview.htm&type=5

Lightning app pages, Chatter, and dashboards are three items that are available in the mobile navigation menu.
The mobile navigation menu allows users to access different items in the Salesforce mobile app, such as objects, apps, or utilities. Users can customize their mobile navigation menu by adding or removing items and changing their order. References: https://help.salesforce.com/s/articleView?id=sf.app_nav_setup.htm&type=5

To make sure that all of the Salesforce users log in using the branded login URL after deploying my domain, and give them a grace period for updating their bookmarks, the administrator should set the Redirect policy to Redirect with a warning to the same page within the domain. This will redirect users who try to log in from
https://login.salesforce.com or another domain to https://nto.my.salesforce.com, and show them a warning message that they need to update their bookmarks. Setting the Login policy or preventing login from
https://login.salesforce.com will not redirect users or give them a warning. Filtering with Form Factor will not affect login URL. References:
https://help.salesforce.com/s/articleView?id=sf.domain_mgmt_redirect.htm&type=5

A permission set group is a collection of permission sets that can be assigned to users as one unit; it simplifies permission management by reducing the number of permission assignments needed for users who require multiple permission sets. A permission set is a collection of settings and permissions that give users access to various tools and functions in Salesforce; it can be used to extend users' access beyond their profile without changing their profile. Creating permission sets and assigning permission set groups can help Cloud Kicks give access to new custom object with custom fields to more than one user by creating permission sets that include access to new custom object with custom fields and assigning permission set groups that contain those permission sets to users who need them. Adding users to manual sharing list or editing organization-wide defaults are not options for giving access to new custom object with custom fields to more than one user; they either do not apply to custom objects or do not grant object-level access. References:
https://help.salesforce.com/s/articleView?id=sf.perm_sets_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.perm_set_groups_overview.htm&type=5

Web-to-Case and Email-to-Case are two solutions that allow customers to create cases from a web form or an email. Web-to-Case generates HTML code for a web form that you can place on your website. Email-to-Case converts incoming emails into cases.
References: https://help.salesforce.com/s/articleView?id=sf.customizesupport_web_to_case.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.customizesupport_email_to_case.htm&type=5