Common Debugging Tips for Roblox

Here are some common tips for debugging Roblox

Check Spelling. Make sure your spelling is right. Many errors are caused by minor typos. If your code isn't working as intended, make sure you don't have a typo. A common typo is Humaniod. The correct spelling is Humanoid, so double check.

Check capitalization. Make sure your object names are consistent in their capitalization. This is important when you are accessing an object within another object.
Special mention to tools. Tools must have a part named Handle. Lowercase handle will not work.

Check your nesting. When accessing .Parent you are going up the nesting in the Explorer. If you nested a Part in another Part, Model, or Folder, you may need to add additional .Parent to the code. If you need to go three Parents up from the script you would add: script.Parent.Parent.Parent and so on for four, five, or more.