How can I remove the blank page after section break?

Adding, or removing, section breaks should only be done when it is necessary (since sections add complexity to the document). More importantly, since breaks are not the only reason for excessive blank pages, you must look into other factors as well.

To see what is going on, start with displaying nonprinting marks, for example by clicking the ¶ button on the Home tab. If you see paragraph marks (¶) taking up space on a seemingly blank page, just delete those.

If an extra page follows after a table, the reason is usually that the paragraph mark after the table has been pushed onto the final page. In this case, you can format the paragraph mark as hidden text. As soon as you hide nonprinting marks, the extra page should go away.

All of the above is discussed in more detail in Suzanne's article that I have already linked to.

I have to admit, I looked through a number of the responses here and everything was far too complicated for a non-professional like myself. But I realized a much more easier solution for those who just want a quick, simple solution to this problem. Suzanne's suggestions, though seemingly prudent, are a bit too complicated for the layman. Quite frankly, I didn't know what she was instructing me to do.

But the user simply needs to look at the next page number and, if it is odd, the user needs to do an Next Page (Odd Page) break. If it is even, the user needs to do a Next Page (Even Page) break and the blank page will be omitted. I have to agree with some of the other users that it is maddening and, even though professionals might have figured this formatting issue out and seem to understand the mechanisms behind implementing it, it's a headache to the non-professional and developers should really consider making this clumsy mechanism more clean in the next update, as it's obviously been an issue for users for years.

One can only dream.