the network consists of people from various backgrounds, nationalities and creeds and is open to those above 18 years old.

How would the previous sentence be correctly capitalized?
Answer: The network consists of people from various backgrounds, nationalities and creeds and is open to those above 18 years old.
different smbs have different storage needs.

How would the previous sentence be correctly capitalized?
Answer: Different SMBs have different storage needs.
even a basic phone, one that does not have an app store and can not connect to a computer network, can run n r $ 200.

How would the previous sentence be correctly capitalized?
Answer: Even a basic phone, one that does not have an app store and can not connect to a computer network, can run n r $ 200.
finding the eight-month study program inadequate, chauvenet proposed a four-year course of study and began lobbying for the creation of a separate naval school devoted solely to academic studies.

How would the previous sentence be correctly capitalized?
Answer: Finding the eight-month study program inadequate, Chauvenet proposed a four-year course of study and began lobbying for the creation of a separate naval school devoted solely to academic studies.