High touch surfaces include:
Tables, doorknobs, light switches, countertops, handles, desks, phones, keyboards, toilets, faucets, sinks, etc.
Cleaning these specific areas is also known as targeted hygiene — to put it simply it means disinfecting those areas, especially when someone is sick.
By doing this and cleaning the right areas at the right time you can stop the spread of germs through your household. It also lessens the burden of an entire house clean in one go.