Nga
The word "nga" is used for linking things together.
Adjectives
You use "nga" to link adjectives to the thing they're describing.
"the tall boy" — "ang taas nga lalaki" (tall = taas; boy = lalaki)
"the fast dog" — "ang dasig nga ido" (fast = dasig; dog = ido)
The word order is often adjective + nga + noun, just like in English, but it can also be done in the opposite order.
That
"Nga" is used to link parts of sentences together. One way it does this is by acting as the word "that," in certain circumstances.
"...the goat that is loud." — "ang kanding nga gahud"
"I know that..." — "Kabalo ko nga..." (kabalo is short for nakahibalo)
"I know [that] she's leaving." — "Kabalo ko nga nagalakat siya." (lakat = walk/leave)
"...the book that I'm reading." — "...ang libro nga ginabasa ko." (book = libro; basa = read)
"He said that.." — "Ginsiling niya nga..." (say = siling)
"I'm the person that will run." — "Ako ang tawo nga magdalagan." (person = tawo; run = dalagan)
Which / Who is
"Nga" also works as the word "which" or "who is."
"...the story, which is true..." — "ang sugilanon, nga matuod..." (story = sugilanon; true = matuod)
"...the food, which they are eating..." — "ang pagkaon, nga ginakaon nila..." (food = pagkaon; eat = kaon)
"My shoes, which are cheap..." — "Ang akon sepatos, nga barato..." (shoes = sepatos, cheap = barato)
"The leader, who is speaking..." — "Ang pangulo, nga nagahambal..." (leader = pangulo, speak = hambal)
Implied
There are many times when "nga" is needed to link words, even though there isn't an English equivalent for "nga".
"Joshua, the son of Maria." ← "Joshua" needs to be linked to "the son of Maria." You would use "nga," between the two.
Word Order
As mentioned, the order is often adjective + noun, like in English. There are several reasons why a person may choose to use the noun + adjective order. Here are a few:
Emphasis
The noun may go first to place extra emphasis on it, like when you're contrasting two items. e.g. "I don't want the white cat, I want the white dog."
Boys & Girls
There are terms like "son" and "daughter" where the gender is explicitly stated in the Hiligaynon terms. These words will usually place the noun first, i.e. anak nga lalaki (child that is a male), anak nga babaye (child that is a female).
Long Adjective
When the adjective is long (in Hiligaynon), putting it last can make the phrase flow better and be easier to understand. e.g. "The uneducated person." — "Ang tawo nga wala nakaeskwela." (tawo = person, walâ nakaeskwela = hasn't gone to school)
There's no need to overstress the fine details of word order when it comes to "nga." Either order is valid. Through experience listening to native speakers, you'll get a feel for what sounds best and what feels most comfortable.