GET: Used when clicking a link to jump to the page you want to see POST: Basically used when you want to save data in the server DB
A mechanism to prevent invalid parameters by limiting the values entered from the WEB, Necessary to avoid a security issue called Mass Asignment.
A symbol is a character string managed by a serial number. : name,: user, etc.
A specific character string or enumeration of numbers is calculated by a calculation procedure based on a certain rule (hash function). Replacing with another value (hash value)
Whether the difference with encryption can be undone The encryption can be restored, but the hash value cannot be restored by anyone, including the person who performed the hashing work.
A method is a function. A method definition puts the process you want to execute between def and end.
def method name
What you want to do
end
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