Icons appear as a Question mark on my MacBook Air - How to fix?

Hi Experts,

I just recently purchased a MacBook Air for myself to learn more about the operating system and how to use it, so my knowledge of how to configure things in it is pretty elementary, if non existant.

I have a problem I can't seem to find a suitable solution with google. On my install, I have 3 icons that appear as Question marks instead of their icons. Please see example image below.

Icons are a Question Mark
Can anyone explain how I can resolve this, so that the Grammarly, Firefox and Skype icons appear as they should?

Please note: Including any screenshots with your comments if possible (that you think may be helpful) would be a real bonus for me and much appreciated at this stage of my learning curve ;-)
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Andrew LeniartSenior EditorAsked:
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David Johnson, CD, MVPOwnerCommented:
Question Marks are broken links. Right Click or control click and select remove item or right click and select "customize toolbar" drag it away and when you release it, it will be removed
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Andrew LeniartSenior EditorAuthor Commented:
Hi David,

Thank you for your comment. When I right click, or press the Control button and left click, the only options I get are:

Show Recents (which just brings up a popup of "No Available Windows" if clicked)
Options > Remove from Dock which did the job of removing it from the dock, as also just dragging the others off the dock.

OS is macOS Hight Sierra Version 10.13.6 so that likely explains why my options differ from what you may be seeing if you're on a different version of Mac OS.

I checked the Applications folder and Grammarly, Firefox and Skype were indeed gone. I'm certain I had installed them so will install them again.

In any case, you were right - it means a broken link - or a link to a program that is no longer installed on the MAC. Will put that into my memory banks for the future.
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Andrew LeniartSenior EditorAuthor Commented:
Thanks very much for helping a noob David. Much appreciated! :)
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