Knowledge is a feature that can be used to meet this requirement. Knowledge allows users to create, manage, and share articles that provide information and solutions for common issues or questions. Data categories can be used to organize articles into different topics and make them easier to find and access. Users can view related articles from the Case page layout based on the data category of the case. Reference: https://help.salesforce.com/s/articleView?id=sf.knowledge_overview.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.knowledge_categories.htm&type=5

Recurring tasks are tasks that repeat at regular intervals, such as daily, weekly, monthly, etc. They can be created by users who have the permission to create recurring tasks, which can be enabled by administrators in the user profile settings. Flow, workflow rule, and recurring activities are not valid options for creating recurring tasks in Salesforce. Reference: https://help.salesforce.com/s/articleView?id=sf.tasks_recurring.htm&type=5

The likely cause for why a rehired user is no longer able to access records they worked on before leaving the company is that the records were manually shared with the user. Manual sharing allows granting access to individual records to specific users or groups. However, manual sharing is removed when a record owner changes or when a user's role changes. When a user is deactivated, their role is removed and any manual sharing involving that user is deleted. When a user is reactivated, their role is restored but manual sharing is not. Therefore, the rehired user will not have access to records that were manually shared with them before deactivation. The stage of Opportunity records, permission sets, or record type of Opportunity records are not likely causes for why a rehired user is no longer able to access records they worked on before leaving the company. Reference: https://help.salesforce.com/s/articleView?id=sf.sharing_manual.htm&type=5

When you mark a field as required in Object Manager, the field is universally required to save a record on that object in the user interface. However, the field is not required to save records via the API on that object, unless you also mark it as required on the page layout.

Page layout and field level security are two factors that determine whether a user can see a new field on a record. To troubleshoot this issue, the administrator should ensure that the page layout for the user's profile has been updated to include the new field and that the field level security of the field for the user profile allows read or edit access. Reference: https://help.salesforce.com/s/articleView?id=sf.customize_layoutoverview.htm&type=5 https://help.salesforce.com/s/articleView?id=sf.admin_fls.htm&type=5