There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What has a ring but no finger?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

John was gifted a new Hayabusa. He drove x miles at 55mph. Then he drove x+20 miles at 40mps. He drove his bike for 100 minutes. How much distance did he travel?

What animal walks on four legs in the morning, two legs during the day, and three legs in the evening?

Oedipus, the king of Thebes, figured out the answer to the riddle:

It belongs to you, but other people use it more than you do. What is it?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

Which is the rope you never skip with?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?