Accidentally Set All Files in /home/(userName) to 755

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I recently installed Ubuntu on a personal computer and I am the only user. I am having this issue where every time I save something to the Desktop the icons rearrange. (I still have not solved this issue so solutions are welcome) In an attempt to solve the Desktop issue I tried executing sudo chmod -R 766 /home/(UserName) because of this thread. This of course set all the files and directories to 766 and promptly messed up all sorts of permission stuff. After I realized what I did, I then turned them all back to 755 using sudo chmod -R 755 /home/(UserName) and slowly went through and changed permissions on individual files ones by one to restrict permissions.
My question:
If I miss something and don’t restrict the permissions, could that lead to problems? Security Problems or otherwise. Thank You

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