update the guide, one more time.

docs/guide.md

@@ -6,17 +6,9 @@ Vietnamese has:
 - Lots of loan words from Chinese (if you know some Chinese, you have something to associate your new vocabulary with).
 - The script: Latin-based.
 
-## 1.1 How to learn Vietnamese (Northern Dialect)
+## 1.1 How to learn Vietnamese
 
-There are so many Vietnamese southern dialect resources and learning guides out there but rarely for Northern dialect. There are several reasons why you may wanna learn Vietnamese in Northern Dialect from the beginning:
-
-- The pronunciation is clearer, sharper, easier to comprehend.
-- Northern dialect is Vietnamese standard dialect.
-- The characters and the tones sound consistent in Northern dialect.
-
-Don't worry about the dialects too much when you have just started learning Vietnamese. The dialect only matters in listening and speaking (I know most of Vietnamese learners know this, but still, I want to emphasize it)
-
-You might wanna watch [this video](https://youtu.be/y1fF69jiavU?si=3f2CvFzjN-8zxPNP) before reading this whole learning guide. This video was made by a successful Vietnamese learner - aNcari (Her Youtube channel name).
+You might wanna watch [this video](https://www.youtube.com/watch?v=GRPnQe2FTrY) and [this video](https://youtu.be/y1fF69jiavU?si=3f2CvFzjN-8zxPNP) before reading this whole learning guide.
 
 ### Beginner study process
 
@@ -51,7 +43,6 @@ _The tone chart._
 
 There are six (6) tones in the Vietnamese language with five (5) tone marks as you can see in the above chart.
 
-
 Both of the above chart are taken from [Omniglot](https://www.omniglot.com/writing/vietnamese.htm).
 
 You might wanna use the chart as a master reference for all singular characters and letter combinations. This will help you a lot when you are learning how to read Vietnamese so I recommend you save it.