 I have this container of water and I will push this container to the left. That means I will apply a force on it to the left as a result of which it will move. And it does. Now I will pull this container to the right and the container starts moving to the right. That means I am applying a force in the right direction. Now can the container be moved to the right if I apply a force to the left? Think about it. No, right? That's not possible. So this shows that in order to move an object in a certain direction, it is necessary, it is important to apply a force on it in that direction. So this shows that force has a direction. Now look at this empty bucket. Let's say you are holding this empty bucket. So you are applying some force and now let's say you are holding a bucket full of water. Again, you have to apply some force, right? In which case will more force be required? I am sure you will say that more force is required to lift a bucket full of water than an empty bucket. Now this shows that force also has a magnitude.