There are many many things. But I can share some of the more obvious ones -
Executive dysfunction issues make 'doing stuff' generally quite hard. So for example, waking up, getting dressed, eating, any kind of personal care - this would take me a very long time and I would often miss steps or have to find workarounds such as sleeping in my clothes, not eating, not wearing socks, not brushing hair etc. I need routine but I can't seem to ever build one and it's like I have to relearn these processes every day. They're so exhausting I often can't do them.
Sensory issues - a big one, I 'shut down' in places like supermarkets, public transport, big shops, theatres, open plan offices as the sensory input is so overwhelming. Important to say that due to alexithymia I couldn't quite pinpoint exactly why I couldn't cope with those environments until I thought specifically through the sensory experience.
Social differences - I don't know how to make a friend.
My battery is about to die so I'm going to post this but may add to it once charged up
Cannot do forms, paperwork, phonecalls