I'm Dave Henderson! For over 34 years, I've made a wonderful living for myself and family of four creating world-class water features using real and faux rock in sunny San Diego as well as professional sand sculptures all around the world. And now I'm taking what I've learned about starting successful businesses, contracting, sculpture, water feature construction, and more, and sharing it with the world. It's my mission to help people like you enjoy more success both in your business and in your personal life.

Learn using videos, interactive exercises, and in-depth articles in math (arithmetic, pre-algebra, algebra, geometry, trigonometry, statistics, calculus, linear algebra), science (biology, chemistry, physics), economics (microeconomics, macroeconomics), humanities (art history, civics, finance, US history, US government and politics, world history), and more (including computer science principles)!


It does not matter how fast you type if you have to go back and fix all your mistakes. Fixing mistakes takes more time than it does to just slow down and take the time you need to type accurately. Fast typing depends on developing precision muscle memory. Allowing yourself to type incorrectly will actually reinforce your bad habits and common mistakes! Slow your typing pace until you can attain 100% accuracy. If you come across a difficult word, slow down further to type it properly. Develop good habits and speed will be your reward.
When you reverse-engineer someone else’s code, testing each line to see how it works, you get a better understanding of the big picture. Thanks to the tons and tons of open-source code that’s out there, you can learn just about anything by examining someone else’s (flawless) work. Just remember to share your code back with the community if inspiration strikes and you improve a part of the program you were fiddling with.
Skyship Entertainment™ is the creator of the beloved children’s brand, Super Simple™. Their award-winning Super Simple Songs® combines delightful animation and puppetry with original and classic kids’ songs to help make learning simple and fun. With over 10 billion views and 10 million subscribers on YouTube, their songs and videos are favorites with parents, teachers, and kids around the globe. 

Luckily, institutions like the Flatiron School and The Grace Hopper Program offer scholarships or deferred tuition to make these bootcamps more affordable for under-represented groups like minorities and women in tech. Check out Course Report for a comprehensive breakdown of the many online and in-person bootcamps—including detailed reviews from their alums, which can help you decide whether a bootcamp is going to help you achieve your programming dreams.

If you want to learn how to code, taking your first steps into this huge universe might seem like a daunting, if not intimidating task. Here’s the big secret: There are plenty of free (and inexpensive) resources you can use to give yourself all the help you need, teach yourself new techniques, and make this learning process fun and exciting—as exciting as coding can get, at least.


I think there’s so much stuff and challenges and quizzes and videos to help, but it gets really confusing sometimes when there’s so much information thrown at you. In the assignments tab I think you should add important key features, viewing the assignments from due earlier to due later, viewing assignments from highest level like 88% on a practice to 100% on a practice and separating them from videos and practices and everything else. It’s really a pain to scroll all the way to the bottom to see my assignments I didn’t complete since my teachers assign a LOT and I mean A LOT of homework on your app. I decided to rate your app fairly and not biased on we’re I like math or not, but rather the methods to teach and learn math. So there are some highlights. I like that you get hints for every single practice and it must be hard to make all of the detailed word problems. I also like that you can look back into the questions you messed up and learn from those questions.

What an incredible app. I’m so impressed. This company deserves loads of money to be thrown at it for making it free. My son has just switched from a Cambridge school to an American School and missed a lot of work. I think we were both about to give up. I didn’t know where to start to help him and being his new school is completely iPad based we felt deep despair at just the thought of trying to navigate through classrooms codes and half working text book apps. Now it’s all here in one place! Simple well explained and the practice really gets your confidence going. He had some maths homework and instead of the total melt down we both would have had trying to work out what was going on we flew through it!! THANK YOU! I love the fact that all the grades are here too so if there is a concept he is struggling with we can go back in the grades to see where that was introduced and work through it! We have been struggling for months trying to find the answer on line. It was only due to the fact that Khan kept coming up that I googled it and found the app. I truly pray this company gets loads of financial support to keep this app going! THANK YOU THANK YOU THANK YOU!!
Take a few minutes (or a day) to think about the reasons—the real reasons—why you want to learn a programming language. Be honest with yourself. Are you trying to learn the barest minimum to score a promotion? Are you looking to make a big career change? Do you want to create the next greatest app? Thrill your roommates by programming your various smart devices to do something awesome?
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