how do youtube, blogger and other web publishing services work?

How would the previous sentence be correctly capitalized?
Answer: How do YouTube, Blogger and other web publishing services work?
researching and learning, weeding through to find useful informationiris

How would the previous sentence be correctly capitalized?
Answer: researching and learning, weeding through to find useful informationIris
all the apartments have one or two bedrooms with one or two bathrooms, as well as a kitchen and an external and private area.

How would the previous sentence be correctly capitalized?
Answer: All the apartments have one or two bedrooms with one or two bathrooms, as well as a kitchen and an external and private area.
it strengthens the immune function and is used against several cancer forms.

How would the previous sentence be correctly capitalized?
Answer: It strengthens the immune function and is used against several cancer forms.