1. LWC - parent child relation - all communications 2. Aura - all communications between cmps 3. Integration Concept - how to send data from sf to external system and vice versa 4. Apex Trigger - concatenate all contacts name in a feild called contact name which is in account object 5. Sharing in Apex 6. Security model 7. permission set, permission set groups 8. Batch apex - can we call batch from triggers? Can we make callouts in Triggers? Can we call another batch from one batch ? When to use queable, when to use @future?