If you are getting notifications from SectionAssist, then your Mac is infected with adware. SectionAssist is adware for Mac.
SectionAssist changes setting in your Mac. First, SectionAssist installs a browser extension in your browser. Then, after SectionAssist hijacks your browser, it modifies settings in the browser. For example, it changes the default home page, modifies search results, and displays unwanted pop-ups in your browser.