First things to be aware of is HA moves on fast with many changes. lately there have been many changes to the UI. This will often render youtube stuff out of date very quickly. Anything over a few months old may lead you i a direction no longer available.
As ever read the Docs first, they will be up to date, then cross reference with youtube and alike if you feel the need.
If after that you are still having issues then the people here will be more than willing to help but we need some info before we can help. so read this and give us some clues to your issue and we will help. We have all been there and really want to help you.