Independent Contractor / Deductions & Credits

Where can I find detail reliable information about eligible deductions and credits as independent contractor specifically for Spark driver, Uber Eats and DoorDash?

 

Where can I find tools, resources, tutorials, or any educational content when filing taxes as independent contractor when you are using more than one platform for example Uber Eats and DoorDash. How that works?

 

Thank you for all your help!