Explanation

Explanation
A listener is an entity that checks for connection requests. The load balancerlistener listens for ingress client traffic using the port you specify within the listener and the load balancer's public IP.
https://docs.oracle.com/en-us/iaas/Content/GSG/Tasks/loadbalancing.htm
To create a listener:
On your Load Balancer Details page, click Listeners.
Click Create Listener.
Enter the following:
Name: Enter afriendly name. Avoid entering confidential information.
Protocol: Select HTTP.
Port: Enter 80 as the port on which to listen for incoming traffic.
Backend Set: Select the backend set you created.
Click Create.

Explanation
The Web Application Firewall (WAF) in OCI provides you with the ability to create and manage rules for internet threats5. Unwanted bots can be mitigated while tactically allowing desirable bots to enter5. Access rules can be limited based on geography or the signature of the request5.

Explanation
How Budgets Work
Budgets are set on cost-tracking tags or on compartments (including theroot compartment) to track all spending in that cost-tracking tag or for that compartment and its children.
https://docs.oracle.com/en-us/iaas/Content/Billing/Concepts/budgetsoverview.htm

Explanation
Graphical user interface, text, application, email Description automatically generated