Where is "du" for masculine countries/states/regions?

Question

Hi,I think this lesson needs to be updated.Because I learned in another lesson that: (https://french.kwiziq.com/revision/grammar/say-where-you-come-from-with-venir-de-d-du-des-country-state-region):De + feminine countries/states/regionsDu + masculine countries/states/regionsIn this lesson, you only mention "de," which confuses me a lot at first to see all the examples are used with only "de". I had to cross-check between two lessons to see if I was understanding correctly.If I'm wrong, please pardon me.Have a nice day.

Accepted Answer

Thy, not sure if I understand the question. 
There are examples of ‘du ….’ in the first lesson you linked - …. du Pays de Galles, for instance. 
The 2nd link is about cities - which as a general rule do not take an article. Therefore for most cities it is just ‘ venir de (city) ‘. The only exceptions are those where the article is a part of the actual name  eg Le Havre (m) - in which case it becomes ‘ venir du (Havre) ‘, or La Rochelle (f) when it becomes ‘ venir de La Rochelle ‘ 
https://progress.lawlessfrench.com/revision/grammar/how-to-use-a-to-in-and-de-from-of-with-cities-prepositions

Answer

Actually there is not a single mention of 'du' in this lesson, but you ask that question, e.g. I come from Monaco should be Je viens du Monaco, not as explained in this lesson 'de'.
You only have de, d' & d'où in your examples.

Answer

Bianca,

I am not sure which lesson you are referring to as not having any examples of ‘ du ‘, as the lesson linked below does have some.

Monaco is considered a ‘country’ under international classification, so wouldn’t be expected to appear in a lesson on cities.

However, Monaco does not take a definite article, so it is ‘ venir de Monaco ‘.

There is a small number of countries that don’t take articles - Monaco is one . You can check country genders at Laura Lawless link.

Venir de/d'/du/des = To come/be from with countries/states/regions and continents (French Prepositions)

https://www.lawlessfrench.com/vocabulary/countries-and-continents/