Custom TV Remote

Hello,

I’m new to Home Assistant and I don’t get the creation of custom cards.

If I add the card for my Bravia TV there is a button for turning it on and if I turn it on I can control the Volume. But if I click on the cast-icon, I can switch the program and see what I’m watching. I want these controls to be on the frontpage of my remote, but I can’t figure out if it’s possible at all.

Can somebody help me with this issue?