notes.md

const categories = [
    { id: 1, name: 'Food' },
    { id: 2, name: 'Rent' },
    { id: 3, name: 'Travel' },
    { id: 4, name: 'Bills' }
]

// categories = Array               =>   Collection
// category = Object                =>   Document
// id, name = Properties of Object  =>   Field 

const expenses = [
    { id: 1, date: '20-11-2023', amount: 500, category: 'Food' },
    { id: 2, date: '21-11-2023', amount: 5200, category: 'Rent' }
]

// expenses = Array
// expense = Object
// id, date, amount, category = Properties of Object