Use & or CONCAT to glue cells together, or TEXTJOIN when you need a delimiter and want to skip blanks.
Do it with AI insteadPick a method
Use & for quick joins, TEXTJOIN for a delimiter across a range.
Write the formula
For example =TEXTJOIN(", ", TRUE, A2:C2) joins three cells with commas.
Fill down
Drag the fill handle to apply the formula to the whole column.
=TEXTJOIN(", ", TRUE, A2:C2)TEXTJOIN adds a delimiter and can ignore empty cells; CONCAT just sticks everything together.