As a freelancer working from home - what home expenses can you record?

Hello,

I am just starting out as a graphic design freelancer and I am very confused about taxes. I understand I should keep a good track of all my incomes/expenses, but can I use any home-related expenses? Part of my rent? My bills? My internet is included in my bills so I won’t be able to show invoices for that but what about the rest?

I don’t owe enough to seek professional advice so I would appreciate if connoisseurs could help out understand any other things I could record as self-employed expenses that I may not be thinking about.

Thanks!