Thank you sir for nice and clear video, I have a question pleas. I make a table that contains in culomn A doctors names and the headers in row1 is the month date. Inside the table all the cells has data validation with departments in hospital to make a monthly rota shift for the doctors. The list of the data valedation contains (main department, long shift, short shift, emergency, operation room, DAY OFF). I want to make a conditional FORMATING THAT IF I CHOOSE "long shift" from the data validation automatically gives this doctor "DAY OFF" for the next day and color the cell of "DAY OFF" in red. How can I do that.( For example if I choose in C5 "long shift" automatically mak D5 "DAY OFF" with red background in B5.) thank you.