Is there an updated tutorial for create an alexa custom skill?

Hi all,
i would like to try to create an alexa custom skill and use custom intents to know for examples the humidity of a sensor… is there an updated tutorial? I found some of them with google, but are not updated and the amazon developer is significative different for a newbie like me…

thanx in advance!

Did you have any luck with this, I’m having trouble getting mine to work

Im trying for long Time to let this work without success