You need to do something asap about those feet. Specifically the toes and more specifically the toe nails. That’s clearly a fungus infection.
You can soak it white vinegar or diluted bleach.
There are a lot of good Asian business pedicure/manicure places that will dug out and trim the sides of the nails with uncanny precision. I don’t suggest them yet because you can pick up an infection or even give one depending on hygiene standard.
In the meantime start home remedy soaking and research. Watch the videos paying attention to time and concentration.
NOW. DON’T DELAY. NOW.