1. History and Data Collection of Covid-19 2. Statistical Analysis of Collected Data 3. Nonlocal Operators and Their Properties 4. A New Mathematical Model of Covid-19 Spread with 9 Classes: Application to Cameroon Case 5. A SCIRD Mathematical Model of Covid-19 Spread with A Lockdown Functions Applications to Russia Case 6. Mathematical Model of Covid-19 Spread with Super-spreaders and Hospitalized Classes: Application to South Africa Case 7. A Covid-19 Spread Model with Two Stages Piecewise Lockdown Function: Application to Turkey case 8. A SEIARP Model of Covid-19: Application to Italy Case 9. A SEIAQPHR Model of Coronavirus Transmission: Application to Ukraine Case 10. A Mathematical Model with Exposed and Quarantined Classes: Application to Nigeria Case 11. Mathematical Model of Covid-19 Transmission Including a Closely Observed Population: Application to Morocco Case 12. A New Mathematical Model with Two Susceptible and Two Infected Classes: Application to Azerbaijan Case