Hi @Zulfariz ,
There is no difference between 3.3 and 3.4 as far as Vertex Colors are concerned:

or even 3.2. Keep watching, it is being explained really well, maybe you’re not at that part yet. If it later is still not clear to you, ask again, but be more specific than saying you are totally lost.
However, as 3.4 is not backwards compatible, assets made in 3.4, might not be usable in 3.3; I’d recommend using 3.3 for this course, to avoid problems.