Explanation
To identify new leads entered by interns from existing leads, the administrator should define a record type and assign it to the interns. This will allow them to select a different record type whencreating leads, and distinguish them from other leads based on record type. Setting up Web-to-Lead form will not work if the interns are entering leads manually in Salesforce. Creating a separate Lead Lightning App or updating the active Lead Assignment Rules will not affect lead identification.
References:https://help.salesforce.com/s/articleView?id=sf.customize_recordtype.htm&type=5

Explanation
Conditional visibility is a feature that allows administrators to show or hide screen components in a flow based on certain conditions or criteria. For example, conditional visibility can show only one question on a screen depending on the value of another field or variable. Conditional visibility consists of one or more rules that define when to show or hide a component based on an expression that evaluates to true or false. In this case, the administrator can use conditional visibility to hide the unnecessary question on the screen flow based on the scenario. References:
https://help.salesforce.com/s/articleView?id=sf.flow_ref_elements_screencmp.htm&type=5

Explanation
Dynamic dashboards allow you to display data according to the security settings of the running user. If users have different access levels to data on dashboards, you can use dynamic dashboards to show them only what they are allowed to see.
References: https://help.salesforce.com/s/articleView?id=sf.dashboards_dynamic.htm&type=5