What is the diffference between gameObject and GameObject?

Questions & Answers
1

Is there any difference between using gameObject and GameObject in code? I read somewhere that you should not use capitals as first letters but have seen both used as script examples.

2

You use GameObject to declare a new variable.

GameObject someObject;

You use gameObject to access some specific gameobject, all its scripts, tags, colliders, everything.

hit.collider.gameObject.tag...