ViewTube

Hi there! Hope you're enjoying the weekend. Quick question: what Simply Explained video would you want to see next? I've got a bunch of ideas but have a hard time picking one. 

Haven't posted videos lately because I was working on a new Udemy course. It just launched and is about creating "Actions on Google". 
Check it out:  https://www.udemy.com/building-your-own-action-on-google/?couponCode=PROMO_9.99 
My focus is now back on YouTube. What video should I make next?
IPFS? Value of cryptocurrencies? Introduction to Graph Theory? ....