Is it necessary to specify the length of the fields when migrating to Laravel?

Question

Laravel

I do migrations like name, about, ... for the user. So the question is: is it necessary to prescribe the length of the fields for such migrations, such as:
string('name', 40)
or
string('name')

Answer 1

string will not be greater than 255 anyway.

Answer 2

If the size of your database is important to you, then it is better to specify the length