@chapipo this is a > 4 year old tutorial.Please avoid older content like that.
Some initial tips here: your learning rate is very high. Change that to be lower.
There’s almost no reason to have 5 dense layers. Reduce your number of layers to just 1 and see how your results are first.
By “1” I mean 1 Dense Layer and 1 output layer.
Follow these pages for some more tips:
Ensure your data is normalized if needed as well. (This is needed if it’s not values between 0 and 1.)
Search around on the forums for post like this:
if the docs aren’t helping you. Feel free to ask clarifying questions as well.