How do you fill manual transmission properly?

To properly fill a manual transmission, start by ensuring the vehicle is on a level surface and the engine is cool. Remove the fill plug, typically located on the side of the transmission, and use a funnel to add the appropriate type of Transmission Fluid until it begins to seep out of the fill hole. Replace the fill plug securely, and check for any leaks. Always consult the owner's manual for the correct fluid type and specific filling procedures for your vehicle.