Once the account gets created, auto-post the account details to a Chatter group (Sales Executive).

Hint: If the Sales Executive Chatter group does not exist in your Salesforce organization, create a new one.

Once the Opportunity is successfully closed, auto-post a linkpost on a Chatter group (Sales Executive). The output should look similar to the following screenshot:

Autocreate a child case whenever the case's Type field changes to Mechanical, and assign it to the Mechanical Engineers queue.

Hint: Go to Create a Queue and give the name as Mechanical Engineers.

Whenever a case gets created, automatically add the user Helina Jolly to the case team members.

Hint: Create a new user named Helina Jolly in your organization.

Once the account becomes inactive, send an e-mail notification to all Opportunity owners related to that account. Also update the related open Opportunity status to Closed-Lost.

Hint: Use the Active field to decide account status. You have to use Flow as well as a Process...