Coding for kids is an important skill to have for the generation. Many youth have made major web browsers and search engines in the past 20 years such as: Google, ksgv2 and Mozilla Firefox. Here I will browse over my personal opinions of where to start.
Scratch
For young coders just getting started, I highly recommend Scratch. It gives you many options. It is great for a kid that wants to make a pretty straightforward game. It is by far the best choice for a quick, fun game. Although I would love new blocks and ways to write variables. Overall I think it is the best place to start boolean logic.
Code.org
Code.org is a fun way to start coding having by far the most options and customizable choices.