I accidentally pressed combination of keys on my keyboard which I don't know what it was. Now, some keyboard hotkeys don't work anymore and the writing cursor doesn't match the "insert" mode.
For example, when I press Ctrl+f, the effect is the same as pressing the right arrow. Ctrl+v has the effect of pagedown.
At the same time, the writing cursor started showing the opposite as it was supposed to be. If I'm in "insert" mode, the cursor shows as a line. If I'm not in "insert" mode, the cursor shows as a square.
I couldn't find any explanation for this. Not even on internet. Is there anyway to go back to the default settings?