What are the best training courses for Cisco firewall configuration?

I've a friend that used Udemy for his AWS and PMP certs. I've dabbled in some cisco training, but it was in early 2000's, mostly books and a friend I worked with at dell who bought a few cisco switches and routers off of ebay to train with. Personally, I didn't follow through with the training, because once a network is built and I don't like the idea of sitting idle in a NOC, I'd rather build something which is why I ultimately chose software development.

FYI, Udemy typically has a sale for their courses and i've thought about doing their cloud courses also, just haven't found the time.