The two types of domains that Marketing Cloud Account Engagement sets cookies on are Marketing Cloud Account Engagement domains and Tracker domains. Cookies are small pieces of data that are stored on your browser when you visit a website, and they can be used to track your online behavior and preferences. Marketing Cloud Account Engagement sets cookies on two types of domains:
Marketing Cloud Account Engagement domains are domains that are hosted by Marketing Cloud Account Engagement, such as go.Marketing Cloud Account Engagement.com or pi.Marketing Cloud Account Engagement.com. Marketing Cloud Account Engagement sets cookies on these domains to track the activities of prospects who interact with your marketing assets, such as forms, landing pages, or custom redirects.
Tracker domains are domains that are owned by you, but are verified and authenticated by Marketing Cloud Account Engagement, such as yourcompany.com or yourblog.com. Marketing Cloud Account Engagement sets cookies on these domains to track the activities of prospects who visit your website, such as page views, time spent, or bounce rate.

Explanation
According to the Salesforce documentation, the answer is true. New feature alerts can be found at the top of the dashboard. A new feature alert is a notification that informs the user about the latest features and updates that are available in Marketing Cloud Account Engagement. A new feature alert can be found at the top of the dashboard in Marketing Cloud Account Engagement, and it can show different information, such as the name, description, or link of the new feature or update. The user can click on the new feature alert to learn more about it, or to access it. The user can also dismiss the new feature alert by clicking on the X icon, or view the previous new feature alerts by clicking on the bell icon. The new feature alerts can help the user to stay informed and updated about the new features and updates that are available in Marketing Cloud Account Engagement, and to take advantage of them. References: Salesforce documentation

According to the Marketing Cloud Account Engagement Email Basics, there are three mandatory components for an email to be saved in Marketing Cloud Account Engagement: a text version, a sender, and an unsubscribe link. A text version is required for accessibility and deliverability reasons, as some email clients or recipients may not support HTML emails. A sender is required to identify the source of the email and comply with the CAN-SPAM Act. An unsubscribe link is required to allow recipients to opt out of future emails and comply with the GDPR and other privacy regulations. Variable tags, dynamic content, and social posts are optional components that can enhance the personalization and interactivity of the email, but they are not required for saving the email draft.

According to the Salesforce documentation, in order to sync a Marketing Cloud Account Engagement prospect field with both a lead and a contact field in Salesforce, the lead and contact fields must have the same API name, and the Marketing Cloud Account Engagement field must be mapped to the Salesforce field. The API name is the unique identifier for the field that is used by the system to sync the data. The field mapping is the configuration that tells Marketing Cloud Account Engagement which Salesforce field to sync with. The Salesforce field label and the Marketing Cloud Account Engagement field type are not relevant for the field sync, as long as they are compatible. Reference: Salesforce documentation

Explanation
The engagement dashboard in B2B Marketing Analytics shows the total submissions across all Marketing Cloud Account Engagement landing pages, as well as other metrics such as views, conversion rate, cost per lead, etc. The engagement dashboard helps marketers measure the performance of their marketing campaigns and optimize their content strategy. The pipeline dashboard shows the revenue generated by marketing campaigns, the account-based marketing dashboard shows the engagement and influence of key accounts, and the multi-touch attribution dashboard shows the impact of marketing touchpoints on sales outcomes.
References B2B Marketing Analytics Overview