question: in the old testament we can read that god said, "let there be light".
Capitalize this past sentence correctly.
A: In the Old Testament we can read that God said, "Let there be light".

question: develop a practice of backing up important files because it helps you a lot in case if you lost important media files
Capitalize this past sentence correctly.
A: Develop a practice of backing up important files because it helps you a lot in case if you lost important media files

question: but all this negatively affects the structure of the hair and makes them brittle.
Capitalize this past sentence correctly.
A: But all this negatively affects the structure of the hair and makes them brittle.