Skip to content
Atlas, your robot learning host

Interim portrait

Atlas · Foundations files-and-folders

Hello, little human. I am Atlas. One useful idea is plenty for a beginning. Read the explanation, then explore an example.

Choose your robot No recording yet · text complete
concept for everyone

Files AND Folders

Files hold content; folders organize files and other folders so you can find your work.

Tune in, human.

Reviewed videos and Shorts

Captions requested · no autoplay

Finding reviewed videos…

    Keep the useful bits, human.

    Beginner field notes

    Choose explanation level
    • A file holds content. A folder groups files and other folders so you can find a project’s pieces.
    • In human-lab/notes/plan.txt, plan.txt is inside notes, and notes is inside human-lab. The folder containing an item is its parent.
    • Check the full filename and extension. Changing a name from plan.txt to plan.py alone does not rewrite its contents into Python.
    See a worked example

    Read a small project tree

    One reviewed sample, shared across levels. Nothing here runs on your computer.

    Example review recorded 2026-10-07 · version 1.

    Example input · do not paste
    human-lab/
  hello.py
  notes/
    plan.txt
    Example output · do not paste
    hello.py is inside human-lab.
plan.txt is inside notes, which is inside human-lab.

    The indentation shows containment. The trailing slash marks folders in this illustration. No terminal command is being run.

    Sources for this sample

    Visual

    The human-lab folder contains hello.py and a notes folder; notes contains plan.txt.

    The reviewed description and complete diagram source are available here.

    Read the complete diagram source

    This is the source for the reviewed diagram, not a command to run.

    flowchart TD
  P["human-lab folder"] --> S["hello.py file"]
  P --> N["notes folder"]
  N --> T["plan.txt file"]
    Full explanation and primary sources

    Reviewed explanation

    A file is a named item that stores content, such as a picture or the text of a program. A folder, also called a directory, groups files and other folders. A project can be as small as one folder containing one source file. You can inspect it in Finder, File Explorer, or your system’s file manager before learning any terminal commands.

    Keep an experiment separate from existing work. You can create a new folder named human-lab inside your own Documents folder using the file manager. This lesson does not create, move, or delete anything on your computer. The tree below is an example of what a small project could contain, not a claim that those files already exist.

    A filename may include an extension, such as .py for a Python source file or .txt for plain text. The extension helps tools choose how to handle the file; renaming an extension alone does not translate its contents. Pay attention to the complete name when saving your first program.

    Source collection

    • MDN: Dealing with files

      Used in: Quick notes · Worked example · Lesson text

      Project folders, nested files and folders, full filenames/extensions, capitalization, and relative references in HTML.

      File-manager navigation, organizing project folders, filenames/extensions, and nested file structures.

    • MDN: Code editors

      Used in: Quick notes · Worked example · Lesson text

      Plain-text source editing, syntax highlighting, opening source files and editor language features.

      Source code is stored as plain text and should be handled with an editor that preserves plain text.

    Notes AI source review · 2026-10-17

    AI source comparison recorded 2026-10-07. Human learner validation is pending.

    Quick quiz · one question

    Find the file and its immediate folder

    Sample scenario. Original synthetic tree only. Slashes show containment and folders have explicit folder entries. These files are not read from or created on your computer.

    Project root
    /human-lab/
    File in the tree
    hello.py
    Folder in the tree
    notes/
    File in the tree
    notes/plan.txt
    Inspect this entry
    notes/plan.txt

    In this project tree, what kind of entry is notes/plan.txt, and which folder directly contains it?

    Answers stay on this device.

    Sources and exercise scope

    Original synthetic exercise. AI comparison against primary documentation recorded on 2026-10-08; the references above state their scope. Human learner validation has not been run. A result here records this attempt; it does not establish mastery.

    Follow this learning pathLesson 1 of 8

    From project files to a small program

    Save or adjust this lesson
    Reference notes · file removal and public access

    Robot reference desk

    Understand what can change

    These reviewed public notes are available to everyone. They do not establish that an operation ran or inspect your files, backups or permissions.

    File removal

    Before deleting files: deleting a file can remove it without putting it in Trash or a recycle bin, and recovery is not guaranteed. Check the intended targets and whether a usable backup or recovery option exists before continuing.

    Sources for this note

    Public access

    Before making a resource public: public read access can let anyone view the exposed content, and public write access can allow changes to data. Check the actual audience, exposed content and allowed operations before continuing. This guidance does not inspect or change your permissions.

    Sources for this note

    A link can carry these public reference topics in its fragment. Page scripts, extensions, browser history and copied links can read them. This page attempts to minimize that fragment when JavaScript runs; reloading afterward can lose the selection. No project details or conversation text belong in a lesson link. Privacy details.