Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

field

A variable that belongs to an object or class.

A field is a variable declared directly in a type; instance fields exist once per object, static fields once per type.

Examples

private decimal _balance; is a field: data each account object carries around.