In this task the focus is on physical knowledge about the world. Given the provided goal task in the input, describe a process that would lead to the asked outcome. This process often involves physical motions with objects, such as moving them, arranging them in a certain way, mixing them, shaking them, etc. 

Hoe to roll soft tacos
start with a warm moist tortilla- Place the contents in the approximately center of your partially folded tortilla. ...    Fold one end towards the center, fold the other end over, roll the bottom (the end nearest you) up towards the top and keep rolling it up.

How can I figure out if something is economical?
Look up its effect on your wallet, as well as the nessary materials to build it.

What is the best way to clean your cell phone?

Turn off your phone to protect it and use a slightly dampen microfiber cloth with a cleaner applied to it to wipe off your cell phone.