Hi
in the future, please use a descriptive title thread, so that our members don't have to waste time opening a thread they are not interested in.
This being said after selecting a cell with a formula you can go to the Formula Tab and click the "Evaluate formula". You can now see the formula at work step by step.
Searching the web for the different functions used in answers will also help to grasp what is going on and what these functions do

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Using O365 v2503 - Did you know you can thank someone who helped you? Click on the tiny scale in the right upper hand corner of your helper's post