The phrase "there is no free lunch" means you can not get the desired things without paying for it.
There's a famous quote <em>"Nothing is free in this life If it's not costing money, It's costing something else" If you got it free someone paid for it Nothing is free.</em>
For e.g. If I want to Score 100 in exam so I will have to give a hundred percent efforts for it.
let's take another example if I want a video gameplay and my parents paid for it, it would be free for us, but it's not actually free. Everything in the world have a cost that need to be paid in order to gain or achieve it.
The characteristics of Play-Doh made it an effective wallpaper cleaner because of how moldable it was to roll up and get the grime off the walls. The second characteristic was how gummy it was because it made it easier to stretch across the grime.