Explanation
Before save flows only support four elements: Assignment, Decision, Get Records, and Loop.
References: https://help.salesforce.com/s/articleView?id=sf.flow_ref_elements.htm&type=5

Explanation
The AppExchange is an online marketplace where customers can find apps, components, consultants, developers, and more to extend Salesforce functionality or solve specific business challenges. Some of the actions that can be accomplished via AppExchange are finding certified developers and consultants who can help with custom development or implementation projects; installing industry-specific solution templates that provide preconfigured apps, dashboards, reports etc., for various industries such as manufacturing or healthcare; downloading free tools or components that enhance productivity or user experience; browsing reviews or ratings from other customers who have used certain products or services; etc. References:
https://appexchange.salesforce.com/

Explanation
Dashboards show data from source reports as visual components that provide a snapshot of key metrics and performance indicators. Dashboards need to be refreshed manually or scheduled to run on a regular basis to reflect the most recent data from the reports. The running user of a dashboard determines whose security settings are applied when the dashboard is run. If the running user is different from the viewer of the dashboard, they may see different data based on their permissions and sharing settings. References:
https://trailhead.salesforce.com/en/content/learn/modules/lex_implementation_dashboards_and_reports/dashboar

Explanation
Account and contact are two records that can be created when using the lead conversion process. The lead conversion process converts a lead into an account, a contact, and optionally, an opportunity. References:
https://help.salesforce.com/s/articleView?id=sf.convert_lead.htm&type=5