It could be Hagrid. Hagrid is always looking out for Harry and giving him things. He might come across this special trunk during one of his travels in the Forbidden Forest or in some wizarding market and think it would be perfect for Harry.
In the learning trunk, there might be a magical map similar to the Marauder's Map but with more detailed information about the Hogwarts library. It could show hidden sections and the location of books related to specific spells or magical theories. There could also be a set of magical crystals that when held, can transport him into virtual scenarios to practice spells and combat skills in a safe environment.
I'm not sure of a specific one off the top of my head, but you can look on fanfiction websites. Try searching for 'Harry Potter trunk farm' and then sort by the highest rated ones. There are likely some great stories out there that explore the unique concept of a trunk farm in the Harry Potter universe.
One interesting fanfiction could be about how the trunk farm is a secret place where magical plants are grown. Maybe the plants have special powers that help Harry and his friends in their adventures. For example, a plant that can create a protective shield against dark magic.
It's very important. It can be a key element for the plot. For example, if a character discovers a long - lost spell in the trunk, it can change the course of the story.
It can be used to store all kinds of things. For example, a student might use it to keep their school projects safe. One compartment for their potions project, another for their transfiguration assignment.
There could be compartments filled with clothes that magically adjust to the wearer's size and the weather. One compartment might hold a set of invisibility cloaks, and another could have a collection of magical maps. Some compartments could be used to store portraits of important wizards and witches that can communicate and give advice.
The learning trunk might offer him a more personalized learning experience. For example, if he's struggling with a certain spell, the trunk could provide a step - by - step guide or even a magical tutor in the form of a spell - casted projection. Also, it could give him the opportunity to study at his own pace without the distractions of a classroom. He can focus on the areas he's most interested in or needs to improve on, like advanced transfiguration or advanced defense against the dark arts.
Another possibility is that it just randomly appears one day. Magic in the Harry Potter world can be unpredictable. One morning, Harry wakes up and there it is at the foot of his bed. Or maybe a magical creature, like a house - elf that knew his mother, decides to bring the trunk to him. The house - elf could have been sworn to secrecy until the right moment when it senses that Harry is ready to discover his mother's secrets.