Google sheet Formulas

I'm in need of assistance with formulas in Google Sheets to analyze data for a project. Specific formulas I would like help with include sum and average, and if and countif statements. The desired outcome from using these formulas is to be able to accurately analyze this data to inform my project. I have a specific timeline and need this completed by August 17th. If you feel you have the experience and understanding to assist me with my project, I look forward to hearing from you.