Question

which block always come at top of the script

Answer 1

Answer:

A hat block is used to start the script, and is always placed on the top of other blocks. The following is the general shape of a Hat Block. Each hat block uses its own way to activate a script, and therefore different scripts can be executed at different time points.

Answer 2

Answer:

Hat type blocks have rounded top like a hat. These are placed on top of the scripts and typically associated with some event which starts our script. They are found in the Events or Control Category. Then there are Stack type blocks which has dents or bumps to form stack of blocks.