Making Google Docs cells mandatory

Guys, this is not programming related (actually i think it is but not sure)

Creating a google doc and i want to make some cells compulsory - to clarify if i have 3 cells (A2, B2, C3), i want to make it compulsory that people will have to fill A2 before they can fill B2, same for B2 and C3. If they don’t fill A2 then they wouldn’t be able to fill B2.