How developers decide what sort of data they should keep in the database ?

[MartinGuptill]

It might sound moronic but I am just newbie at mysql and can do basic mysql task like creating dB, feeding data into it but while practicing some project I got stuck with the idea that in real world how does programmer know what to store in dB other than password, id, email , do they only store form's data or some ???

[rozysharma]

 In order to ensure data accuracy, you must design a database that only . all kinds of information you might want to store in the database. We have to be clear on that: Every database should, at least, ... as too much indexing can be as bad as too little and because the data type of the columns. 

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[LuisaRey]

I will keep data  1. user email address 2. username 3. password 4. their previous order details We applied the same setting for Embroidery Prince