Core computer / dev
CLI
Typing commands in Terminal instead of clicking buttons.
Env var
A hidden setting/value (often API keys) used by apps.
Git
Tracks changes so you can undo/rollback later.
GitHub
A website that stores git repos (great for publishing and backups).
GUI
The normal app interface: buttons, windows, menus.
Path
A file’s address, like /Users/you/Desktop/file.txt.
Repo
A project folder tracked with git.
Shell (zsh/bash)
The “command language” Terminal uses.
Terminal
The app where you type CLI commands.
Web + integrations
API
A way for apps to talk to each other.
API key / token
A secret code that lets you use an API.
Auth
How a site checks it’s really you.
Authorization
What you’re allowed to access/do.
DNS
The internet’s phonebook for domains.
Domain
Your main site name (like diogobuilds.com).
OAuth
“Log in with Google” access (no password sharing).
Polling
Checking again and again: “anything new?”
Rate limit
A cap on how many requests you can make.
Subdomain
A “section” of your domain (like ops.diogobuilds.com).
Webhook
A service sends you a message when something happens.
AI / LLM
AGI
Human-level AI at everything (not real today).
Agent
An AI that can take actions (browser, files, tools).
Autonomy
An agent runs tasks without you asking each time.
Context window
How much text the AI can read at once.
Embedding
Tech that lets you search text “by meaning”.
Hallucination
The AI confidently makes stuff up.
Heartbeat
A periodic “check-in” that can waste money if too frequent.
LLM
The AI “brain” that writes text (ChatGPT/Claude/Gemini).
Local model
An AI model running on your own computer.
Prompt
What you tell the AI to do.
RAG
AI answers using your saved docs/notes.
Tokens
The unit used to measure AI text and cost.
Automation / ops
Cron job
A scheduled task (like “every day at 9am”).
Daemon / Service
A background app that keeps running.
localhost (127.0.0.1)
Only works on the same computer.
Port
A number for a local app URL (example: :18789).
Tunnel
A safe way to access a local app from anywhere.