Explanation
Two considerations for preventing users from accessing Salesforce from outside of their network are:
IP address restrictions are set on the profile or globally for the org, which limit login access based on IP ranges specified by an administrator Restrict U2F Security Keys on the user's profile to enforce login hours, which require users to use security keys during certain hours of day Assigning single sign-on to a permission set or enforcing Login IP Ranges on Every Request will not prevent users from accessing Salesforce from outside of their network. References:
https://help.salesforce.com/s/articleView?id=sf.security_networkaccess.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.security_keys_restrict.htm&type=5

Explanation
Forecasting is a feature that allows you to predict and plan the sales cycle from pipeline to closed sales, and manage sales expectations throughout your organization. Opportunity stages are the steps that an opportunity goes through as it moves from creation to close, and they determine the probability and forecast category of the opportunity. References:
https://help.salesforce.com/s/articleView?id=sf.forecasting3_overview.htm&type=5https://help.salesforce.com/s

Explanation
Process Builder is a tool that can be used to implement this request. Process Builder can create record-triggered flows that execute actions when certain conditions are met. In this case, Process Builder can create a flow that executes when a contact with a title of CEO is created and updates the contact's account record with the CEO's name. References:
https://help.salesforce.com/s/articleView?id=sf.process_overview.htm&type=5

Explanation
Two-factor authentication requires users to verify their identity with two pieces of information when they log in to Salesforce. One piece is their username and password, and the other is a verification code from an authenticator app or email or SMS.
References: https://help.salesforce.com/s/articleView?id=sf.identity_2fa_overview.htm&type=5
https://help.salesforce.com/s/articleView?id=sf.identity_2fa_login_flow.htm&type=5