"SCAN" & "REDUCE" Functions in Google Sheets

Want to understand how to use the "SCAN" & "REDUCE" functions in Google Sheets? Want to get the cumulative values in a range or array in Google Sheets? You have come to the right place, just watch this video and be productive :)
Added benefits of watching the video - know how to use
1. "SEQUENCE"
2. "LAMBDA",
3. "INDIRECT"
4. "CONCATENATE"
functions in Google Sheets.