I really need to make a cheat sheet lol. Bit of trouble remembering masc/ fem/ neut. Singles, plurals etc... I'm British but since i didn't take English language and lit at school many years ago i spend a lot of time guessing what people with a more... Formal education are on about lol. Don't get me wrong, the app and course are fantastic, it's just the comments i struggle with at times. Tusen takk!
In this case, you can tell from the suffix -en that we're dealing with either a masculine noun, or a feminine noun declined as if it were masculine. If a definite singular noun ends with the suffix -et, you'll know that it's neuter.
The indefinite articles "en" (m/f), "ei" (f) and "'et" (n) can help you figure out the gender of indefinite nouns.
This only helps you to pick out genders from a text though, if you want to produce your own you're going to have to memorise the gender of each noun. This is done by learning each noun not as "hund" and "tre", but "en hund" and "et tre".