How much does it cost to live? That’s a good question—especially if you’re moving into your own apartment for the first time or if you’re new to Germany. You might be experiencing other changes that will impact your monthly budget

Electricity & Internet comparison : https://www.check24.de/
Basic Rent: The net rent you pay for the "cold rooms". In other words: The rent without heating costs and other additional expenses.
Waarm rent (Warmmiete): The "inclusive rent", i.e. the rent including heating costs and running costs.