This video shows the LIFE CYCLE of the lambda which helps to finetune your lambda function for reduce the cost and improve the performance.
Phases of Lambda INIT, INVOKE, SHUT_DOWN
LAMBDA RE-TRY
Tips to improve performance and reduce cost

AWS Lambda Play list:    • AWS Lambda function - Beginner to Adv...  
IAM overview:    • AWS IAM Crash course,  AWS IAM Tutori...