If you are getting notifications from SampleSkilled, then your Mac is infected with adware. SampleSkilled is adware for Mac.
SampleSkilled changes setting in your Mac. First, SampleSkilled installs a browser extension in your browser. Then, after SampleSkilled 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.