this girl is very happy, she wants to dress in colors. help her to choose some dresses to fit her best.

How would the previous sentence be correctly capitalized?
Answer: This girl is very happy, she wants to dress in colors. Help her to choose some dresses to fit her best.
many of the substances in the hair loss natural remedy involve green tea and green coffee extract, both well-known for their antioxidant properties.

How would the previous sentence be correctly capitalized?
Answer: Many of the substances in the hair loss natural remedy involve green tea and green coffee extract, both well-known for their antioxidant properties.
using ram for temporary files?

How would the previous sentence be correctly capitalized?
Answer: Using RAM for temporary files?
everyone is invited to help, in the good spirit of free software.

How would the previous sentence be correctly capitalized?
Answer: Everyone is invited to help, in the good spirit of Free Software.