the 1+1-cavity mould features a version for left and for right-handed users.

How would the previous sentence be correctly capitalized?
Answer: The 1+1-cavity mould features a version for left and for right-handed users.
customers who bought this product also bought:

How would the previous sentence be correctly capitalized?
Answer: Customers who bought this product also bought:
3.) set winner: this bet refers to the winner of a specific set.

How would the previous sentence be correctly capitalized?
Answer: 3.) Set Winner: This bet refers to the winner of a specific set.
when it's deleted by symantec email security.cloud, the infected dll file would be removed too.

How would the previous sentence be correctly capitalized?
Answer: When it's deleted by Symantec Email Security.cloud, the infected DLL file would be removed too.