As part of my machine learning journey I took the DeepLearning.AI TensorFlow JS course. Thanks to it I could apply my knowledge of neural networks into a working web apps - like toxicity detector or Rock Paper Scissors Lizard Spock game with computer vision. Thanks to the TensorFlow JS all of the code could be executed on the user machine - no data had to be transmitted back to the server. You can try this apps for yourself - just click on links above (unfortunately mobile platforms have limited support for now).