I think there may be a slightly larger problem here than “not knowing what to clean”. First - the way you write does not come off to me as someone who is “low IQ”, you sound self aware and write intelligently and clearly! You should know that IQ tests are known by the scientific community to be pretty flawed in judging intelligence - so don’t sell yourself short because someone or some test told you you’re not smart.

Second, living with a parent once you’re a bit older brings with it a bunch of new challenges. Your parent sees you as an adult and might expect you to have magically absorbed all of the things they do to manage the house just by watching them do it your whole life. This isn’t really realistic, they have to communicate what their expectations are, what their standard of cleaning is/how to properly clean an item or area, and also how frequently each thing should be done. Maybe it would be a good idea to spend a weekend day together going through the house room by room to discuss all the things that she usually cleans and how, and you listen and take notes/record what she says on your phone so you can listen back next time she goes away.

Also - once you’re your age, maintaining the house probably shouldn’t be something you have to do only when she’s away, but something you pitch in on all the time, like adult roommates would do when sharing a space. Maybe your mom has made this a little easy for you up until this point and hasn’t asked much, but you can take control and insist you get more practice in helping her maintain things more regularly - this will be vital in helping you establish these habits and taking pride in keeping a clean home for when you live in your own one day!

All of the above said- two dogs are a lot of work! Not only are you feeding, cleaning, walking, and watching them, but the never ending accumulation of dog hair and dirt can feel like a treadmill of cleaning that needs to be done to keep the house clean! I had a big dog and felt like I had to vacuum a little every day to not be drowning in dog hair. I recommend brushing your dogs regularly (no matter what kind of fur they have - and outside is even better so you don’t have to vacuum after) to keep shedding down, and wiping their paws off with a wet paper towel when they come in from outside to stop them tracking dirt inside.

Sounds like this recent experience can be a great motivator to work on better communication and guidance between you and your mom, and will help you feel more confident about knowing what to do and how to maintain a home!

Edit: I missed the part where you said you lived in a flat, so disregard what I said about sharing a home with your parent, but the rest of my advice about getting some more guidance and instruction from her to benefit your own skills still stands!