Explanation
dobe Campaign allows you to create different types of campaigns, such as recurring campaigns, periodic campaigns, or transactional messages2. Each campaign has a start date and an end date that can be defined in the execution schedule.
However, these dates are not used to control the campaign execution. They are only used to display the campaign information in the Calendar UI3. Therefore, even if a campaign is sent past the end date, it will not affect its functionality.

Explanation
Adobe Campaign allows you to send messages across different channels, such as email, SMS, push notifications, etc. You can also configure and schedule your deliveries according to your business needs and objectives2.
To ensure that the offers are controlled in a sequential send, you need to use an incremental query and apply the Capacity Typology rule3. An incremental query is a type of query that lets you select a subset of recipients based on a fixed number or a percentage. The Capacity Typology rule is a type of typology rule that lets you limit the number of messages sent per day for a specific channel.
https://experienceleague.adobe.com/docs/campaign-classic/using/sending-messages/key-steps-when-creating-a-d

Explanation
The functionality that enables a business practitioner to display different variations of content to the recipients of the email delivery according to a predefined condition configured in the expression editor is called Dynamic content .