Unable to find understand what page titles people have been visiting on my website
I am new to google analytics so sorry if this question is foolish. I am trying to track what pages people visit most on my website using google analytics using page titles under behavior. However the page titles that are displayed are either meaningless (keycode51635360.spacebarnot.work), or send me to websites that aren't mine. Could someone please explain why this is happening, and what I can do so that the page titles reflect those of my website?
Thank you very much.