Edtech Backend class 1

 how otp works ??

first user come to the website -- >  enters the data -- > redirected to OTP page -- >  OTP is sent via mail 
-- > enters the OTP -- > if Correct then user created in DB.

so we want user only create after mail sent . we have to use pre middleware/hook


class 3 :-  how course created 
every course have tags(catalog) assign to them which is used in searching and filtering purpose 

create tag authority only have Admin --> we can make protected route using isAdmin method

course content :- have section :- which have subsection 

everything is CRUD operation in backend 
create course and getAllcourse

before course creation there should be tag available by the admin

lecture flow -> tag controller -> course -> section -> subsection 

in course we 

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