Hi email@example.com Welcome to the world-wide Canvas community! People use sections for a variety of reasons, and you can see somewhat of a run-down of limitations in the blue area at the top of this page: How do I limit a user to only interact with other users in the same course section? But to directly answer your question, yes you can have multiple instructors in a course, though depending on how the course is taught sections may or may not be the answer. (So much for a definitive answer! )
Basically, CONTENT (such as pages but also non-graded discussions that do not have a due date) will be able to be viewed by ALL users of the course. On the other hand, below is a listing of pages where you CAN limit specific assignments to a specific section of students:
Be aware that both instructors will be able to view the ENTIRE gradebook by default (which again could be a "minus," depending on how the course is taught), though one CAN limit viewing a gradebook by a specific section, as well: How do I use the Gradebook? (see the Filter Students heading on that page).
I hope this helps a wee bit. Others in the Community may offer some of their own experiences.
You mention "add course content". It sounds like the sections may be independent of each other. Perhaps the sections should be separate courses in Canvas, rather than being under a single course shell.
If you are using a sis import, you can set them up as detached and each will have their own sections with control over thier own content. Do they all need to see a common grade book with their content ( say quizzes) counting to a final grade?