Please capitalize where necessary: before you can open a editor file, you'll need to figure out what kind of file the editor file extension refers to.
A: Before you can open a EDITOR file, you'll need to figure out what kind of file the EDITOR file extension refers to.

Please capitalize where necessary: the speed changes automatically in a speed program.
A: The speed changes automatically in a speed program.

Please capitalize where necessary: the humor is primarily found in the interactions and conflicts between the aging adventurers and the young prince, and the fact that the world has changed a lot for the older adventurers while they were resting on their laurels.
A: The humor is primarily found in the interactions and conflicts between the aging adventurers and the young prince, and the fact that the world has changed a lot for the older adventurers while they were resting on their laurels.

Please capitalize where necessary: for most people, the children this is the meaning of life, because they are hidden all the hopes of their parents.
A:
For most people, the children this is the meaning of life, because they are hidden all the hopes of their parents.