Wiring smart switch, confused about mishmash of wires in wall box
That appears to be a very straightforward setup, with neutrals in the box. You may well lack grounds at that era. You could have had switch loops, but don't appear to in this box.
Following normal procedures:
Unswitched Line Power coming in on black to the hall switch, fed from the hall switch to the outdoor light switch.
Switched power from hall switch out on red.
Outdoor light switched power out on black, split three ways.
Neutrals joined.
If two switches in a single box are joined, that's nearly always going to be the unswitched power to both.