The interface improvements that have been made since then have been amazing for discoverability and they have kept (most of) the old keyboard shortcuts too. This is not a bad thing at all, but it does mean that there are tutorials which still make it seem like Blender requires just knowing and memorising loads of keyboard shortcuts.
When learning Blender, the space bar is definitely your friend these days.
The interface improvements that have been made since then have been amazing for discoverability and they have kept (most of) the old keyboard shortcuts too. This is not a bad thing at all, but it does mean that there are tutorials which still make it seem like Blender requires just knowing and memorising loads of keyboard shortcuts.
When learning Blender, the space bar is definitely your friend these days.