Agree with
@delpiero.
Simply select the response that is applicable to you and mark whatever is not applicable N/A.
Your score is calculated on the basis of your responses.
The system cannot tailor itself for any one person as soon as they visit the page.
Specifically, explanations are provided under every question. So read everything carefully before you choose a response. You'll find your explanations right there.
For family size, it is explained what constitutes family. If you are single or never married, your family size is 1.
Depending on family size, your requirement of settlement funds is calculated.
If you want to claim points for a sibling in Canada, you will have to select a response that states you have a sibling who is already a PR or citizen (as applicable).
Certain fields like Spouse details etc only become available if you select that you are married. As a single applicant, you wouldn't see them at all.
The NOC that you eventually select in the Express Entry Profile will help them slot you into the FSW pool and not FST. Those details are added later.
All the factors cumulatively help you get points and make your chances of getting an invitation stronger or weaker depending on what your responses are.
They are relevant and not at all frivolous.