Can't figure out Laravel relationships?

Question

Laravel

I am going through php training, now we are writing a project on laravel and something is stuck on relationships. Can't figure out how it works? Already read the dock and third-party resources and that there is no complete picture yet.
The question is. There are 3 tables task, user, status. I need an association between task=user and task=status.
Task = Status I set up and then probably more by typing. Now this is how I get the status name $task->status->name
of the Task model

public function status()
    {
        return $this->belongsTo(TaskStatus::class);
    }

task migration

$table->id();
            $table->string('name');
            $table->string('description')->nullable();
            $table->integer('status_id')->default(1);
            $table->integer('created_by_id');
            $table->timestamps();

status model

public function task()
    {
        return $this->hasMany(Task::class, 'status_id');
    }

status migration

$table->id();
            $table->string('name');
            $table->timestamps();

everything works, in a similar way $task->status->name I get the status

by analogy, I try to get the name of the user who created the task
model Task

public function user()
    {
        return $this->belongsTo(User::class);
    }

user model

public function tasks()
    {
        return $this->hasMany(Task::class, 'created_by_id');
    }

but when trying to get the name $task->user->name comes null. And I don't understand why. Everything seems to be the same as in the first case ... in short, stuck. I tried to link tables through foreign, but there I threw errors during migration ...
At the same time, I’ll sit down myself and look at what I wrote, sometimes you write a question and then you find the answer yourself .... well, or who will tell you where to dig to figure it out ....

Answer 1

$table->integer('created_by_id');
replaced by

$table->foreignId('user_id')->constrained('users');

only the id field in the users table should be
$table->id();
i.e. bigIncrements