Hi, at min 9 wenn i press CTR + F to fill grid, Blender crashes. I am going to press F and try to fallow along.
CTRL+F brings up the 'Face Menu', it doesn't perform a Grid Fill. Grid Fill doesn't have a shortcut anymore. You can use the search bar
or go to Face > Grid Fill:
You can assign a shortcut yourself or make it a quick favorite. (Right click on Grid Fill will give you those options.)
But if CTRL+F crashes Blender you should report it (Help > Report a Bug).