Rather than say “search the forum” I will say RTFM [1]
Start here https://www.home-assistant.io/getting-started/
Then read all the pages here https://www.home-assistant.io/docs/ (some of them may be overly complex for a beginner, but they do give you a very good view of how HA works).
And of course before asking questions, read this How to help us help you - or How to ask a good question
[1] Read The Fine Manual