What are there many kind of order of reaction like 1st ,2nd,3rd and what is the difference and how to calculate for the order from the given reaction ?

in first order rxn always one component is taken in excess and in zero order rxn no any reactants is taken in excess

https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Kinetics/05%3A_Experimental_Metho...