According to the Data Cloud documentation, the Is Equal To operator is case-insensitive, meaning it matches values regardless of capitalization. Therefore, the segmentation criteria filtering on City | Is Equal To | 'San Jose' will include cities that contain either 'San Jose' or 'san jose'.

The type of the Event Time Field while ingesting Engagement data should be Immutable. Immutable means that the field value cannot be changed once it is ingested. The Event Time Field is a mandatory field for Engagement data that represents the timestamp of when an event occurred. It is important to keep this field immutable to ensure the accuracy and consistency of the event data. References: Engagement Data Model

These three actions can be applied to a previously created segment. You can export a segment to a CSV file, delete a segment from Data Cloud, or copy a segment to create aduplicate segment with the same criteria.
References:https://help.salesforce.com/s/articleView?id=sf.c360_a_segmentation_actions.htm&type=5

A window function is a unique requirement of a Streaming Insight query. It defines the time interval for the query to run on the streaming data and thefrequency of the query execution. References:https://help.salesforce.
com/s/articleView?id=sf.c360_a_streaming_insights.htm&type=5

These two steps are required when configuring a Marketing Cloud activation. You need to select an activation target that represents a Marketing Cloud business unit and a contact point that represents a Marketing Cloud data extension.References:https://help.salesforce.com/s/articleView?id=sf.
c360_a_data_cloud_marketing_cloud.htm&type=5