I can't move with cursor nor keyboard text pointer when I'm learning HTML

It’s sort of glitch, I guess. I changed from Chrome to MS Edge, and it worked for some time, and same thing appears now on Edge. I can’t move anywhere, therefore I can edit code and type new text per instructions. I can’t do anything. Now I’m going to try with Safari.
Edit: Actually pointer goes around but not where I want it to be.

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