In this first example, we have a big set of data that contains a lot of blank rows.
To quickly remove these blank rows, I can use Go To Special.
First, pick a column that should always contain data.
In this case, Column A should always have a name.
Then go for the column, and use Ctrl + G for Go To.
Then Special, then select Blanks.
At this point, every blank cell in column A is selected.
Now use Control minus to delete, and choose Entire row.
When I click OK, all blank rows are completely removed.