I am making a network based Android application. I have created a server on my web hosting. I have used PHP and MySQL to handle database operations, now I want to assign a user to this database and grant him/her privileges so as to manipulate data.
However I am not sure which privileges I should grant to the user and which not, I have attached a screen shot to the page asking me to grant privileges, I want to know what will be secure and what can cause me potential harm.