Sch C business expenses vs office expenses

What constitute Home office expenses (require you file from 8829 attach to Sch C)  vs expenses listed on Sch C.

 

Some confusing items are

 

Office expenses, Repair and Maintenance, Utilities, Wifi bill are listed on Sch C as Business expense. So What are Business use of your home expenses which require form 8829?


These are TT  office expenses for Main Sch C .

Office expenses are any additional expenses you incurred this tax year that were related only to your office space.

Examples include:
- Business membership fees to superstores like Costco and Sam's club
- Pickup and delivery services
- Bottled water delivery
- Shredding services
- Backup data and archiving services

More examples:
- Office cleaning
- Handicap access expenses
- Office decorating expenses
- Separate cable line for your office
- Separate security system for your office