Really confused on how to calculate "Income for the month" on healthcare.gov application

I turned 26 recently and work self-employed, so I’m looking at getting insurance on the marketplace.

Pretty much everything when it comes to health insurance is new to me, so this whole process is very confusing and frustrating for me. Right now I’m stuck on the “[name]’s income for the month (July 2024)” Portion of the application, where it says, “Enter each type of income NAME gets this month. If NAME won’t get income this month, but gets it during other months in 2024, report that on the next page.”

Then it gives me a section to add income for July and expenses for July where it says, “You can only subtract these expenses: Student loan interest, alimony, IRA contributions, or educator expenses.”

Does this mean healthcare.gov is only going to consider my raw income before any expenses? I’m not to subtract anything like supply expenses, work travel expenses, self employment taxes, or anything from this income? My income also changes dramatically from month to month, so I assume I put down an average?