If you gave me a cup of coffee for every time someone asked me this question, I probably wouldn't close an eye for the rest of my life. 👀
However, I have the real answer on this really important question for you.
Let me fall with the door in the house (Dutch saying: Met de deur in huis vallen. Meaning: Immediately getting to the point). The real answer is that there are no exact rules on when to use "de" or "het" that cover all cases. However, there are a few strict rules and some guidelines that might help you go through this struggle. Fasten your seatbelts and bear with me.
So here are 7 strict rules to keep in mind.
Rule #1 - Plural nouns always have the article "de".
Examples:
- het boek (the book)
- de boeken (the books)
Rule #2 - Fruits and vegetables always have the article "de".
Examples:
- de banaan (the banana)
- de komkommer (the cucumber)
Rule #3 - Compass points always have the article "het".
Examples:
- het noorden (the North)
- het zuiden (the South)
- het westen (the West)
- het oosten (the East)
Rule #4 - Nouns in the diminutive form always have the article "het".Examples:- de hond (the dog) - normal
- het hondje (the dog) - diminutive
Rule #5 - Nouns in the diminutive form, but also plural always have the article "de".
Examples:- de hond (the dogs) - normal
- het hondje (the dogs) - diminutive
- de hondjes (the dogs) - diminutive & plural
Rule #6 - If we use a verb as a noun, we always use "het".
Example:
- Het wachten is voorbij (the waiting is over)
Rule #7 - Names of languages always have the article "het".Example:- Het Nederlands
- Het Italiaans is een mooie taal. (Italian is a beautiful language)
Now we go on to some guidelines. These guidelines are all cases in where the word "often has de or het".
Guideline #1 - Nouns with two syllables starting with be-, ge-, ver-, and ont- often have "het".Example:
- het verhaal (the story)
- het gezicht (the face)
Guideline #2 - Nouns ending in -ing, -ij, -er, -aar, -heid, and -ie often have de article de.
Example:
- de verzekering (the insurance)
- de overheid (the government)
Guideline #3 - Nouns ending in "er" or "el" often have the article "de".Example:
- de kamer (the room)
- de kabel (the cable)
Guideline #4 - Nouns ending in -isme, -ment, -sel, or -um often have the article "het".
Example:
- het moment (the moment)
- het veganisme (the veganism)
Guideline #5 - Nouns referring to a profession often get the article "de".
Example:
- de bakker (the baker)
- de leraar (the teacher)
Guideline #6 - Words of trees and plants always have the article "de".
Example:
- de boom (the tree)
- de tulp (the tulip)

There are no rules that fully cover the usage of "de" and "het". Therefore my personal advice to you is when you learn a new word, don't only learn the word, but also learn if it comes with "de" or "het". The only way to get "de" and "het" right is by getting a native feeling for it. Let's discuss how to practice.
You can simply practice by reading, writing and listening to Dutch. If you read a sentence containing "de hond" (the dog) a couple times, you will automatically know it's "de hond" instead of "het hond". I mean honestly, learning a language is a matter of doing and repeating.