vertex snapping

Hi Vinay,

Have a look at what you are Snapping with (Snap Base).

Okay, at that 11:30 mark, I don't know exactly what is not working for you..(but I must admit, that it took me a while to get used to how Snapping works in Blender)

What do you mean by "select all the vertices"?
You only want to select the vertices you wan to move, not the vertex you want to snap to and certainly not all vertices.

With snapping enabled, vertex selected in the snap target options and the correct vertices selected, left click and hold on the red X axis on the gizmo and then move the mouse over the vertex you want to snap to (align with).
A square indicator should appear over the 'snap to' vertex and the selection snap to the correct position.

Ok that looks like you may have more vertices selected than just the ones you want to align.

Snapping is weird and takes a little getting used to, but it's like riding a bike, we all fall off at first but once you know how it is easy.

Also remember before the Fundamentals there is the Blender Basics, it is the course JL always refers to as "what we saw in the basics". It is the very first step to take. So you may want to start with this course before you tackle the Fundamentals. Linking up:

https://cgcookie.com/courses/blender-basics-an-introduction-to-blender-4-x

Sorry, I'm a bit late, but the way I read your Screenshot is like this:

(And yes, Blender Basics is a must!)