before you can open a dag file, you'll need to figure out what kind of file the dag file extension refers to.

How would the previous sentence be correctly capitalized?
Answer: Before you can open a DAG file, you'll need to figure out what kind of file the DAG file extension refers to.
but for anyone wanting to become or remain successful, inaction is simply not an option.

How would the previous sentence be correctly capitalized?
Answer: But for anyone wanting to become or remain successful, inaction is simply not an option.
few student can begin their studies having already written a mathematical paper.

How would the previous sentence be correctly capitalized?
Answer: Few student can begin their studies having already written a mathematical paper.
and of course don't forget to see the iconic sagrada familia and hospital de sant pau.as you can see the area has a lot to offer!

How would the previous sentence be correctly capitalized?
Answer: And of course don't forget to see the iconic Sagrada Familia and Hospital de Sant Pau.As you can see the area has a lot to offer!