In this video ("Blender Beginner Tutorial - Part 4: Material Nodes", around minute 34) the author uses the "Proportional editing" mode and chooses the falloff type to be "Random".

I tried to do the same but it doesn't give the same wavy shape. I think the randomness effect isn't that great in my case but I don't know why.

enter image description here

I tried to press W and then "Subdivide Smooth" to add more segments to the shape but I still don't achieve a great effect.

Any ideas?

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    $\begingroup$ You are on the right track, subdividing will give you greater resolution and make the effect more useful. Also while moving a vertex use the mouse wheel to increase the area of influence. $\endgroup$ – rob Oct 3 '18 at 14:41
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    $\begingroup$ You should add to your question that the pertinent portion takes place at around 34:00. In Proportional Editing you control the area that is effected with the mouse wheel. You will see a circle that shrinks and grows respectively. $\endgroup$ – Dontwalk Oct 3 '18 at 14:47
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    $\begingroup$ You should also press Z after pressing G. This will constrain the movement along the z-axis only which is what you want. $\endgroup$ – AshKB Oct 3 '18 at 14:59

After having initiated the G ("move") action, scroll up the mouse wheel (MMB wheel) to enlarge the area of influence of the proportional edit.

While scrolling (up or down) you'll see a circle representing roughly to what spatial extent the other vertices will be affected. Make sure it is large enough to encompass several of the other vertices.

Then just keep moving the selected vertex to see the effect. (As Ashutosh Budhdeo noted, you may want to use Z during the "move" action to constrain the movement to the vertical axis).

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