No Risk No Gain. What do you understand by the slogan?

The slogan “No Risk, No Gain” means that achieving significant success, growth, or rewards requires stepping into uncertainty and embracing the possibility of failure. Sticking entirely to your comfort zone may keep you safe, but it limits your potential for extraordinary outcome

You need to start something at risk to have a gain later

Life itself is full of risk. For you to benefit from anything, there is a price to pay which is the risk involved. So No pain No gain.