Question

what is important to do when using a grinder on a platform?
use a flame retardant blanket to catch falling sparks
press the metal to the disc prior to starting the grinder
press forcefully against the metal while grinding
wear rubber footwear while grinding

Explanation:

When using a grinder on a platform, sparks can fly and pose a fire - hazard. A flame - retardant blanket can catch these sparks. Pressing metal to the disc before starting can be dangerous, pressing forcefully can damage the grinder and the workpiece, and wearing rubber footwear is not the most important safety measure related to the grinder's operation on a platform in terms of fire prevention and basic grinder - use safety.

Answer:

use a flame retardant blanket to catch falling sparks