Cargo and Dependencies

# Cargo.toml
[package]
name = "my_project"
version = "0.1.0"
edition = "2021"
authors = ["You <you@example.com>"]
description = "A great project"
license = "MIT"

[dependencies]
serde = { version = "1", features = ["derive"] }
tokio = { version = "1", features = ["full"] }
reqwest = { version = "0.11", features = ["json"] }
chrono = "0.4"

[dev-dependencies]
# Only for tests and benchmarks
mockall = "0.11"
proptest = "1"

[build-dependencies]
cc = "1"  # For build scripts

[features]
default = ["std"]
std = []
async = ["tokio"]

[profile.release]
opt-level = 3
lto = true
codegen-units = 1  # Better optimization, slower compile

[profile.dev]
opt-level = 0  # Fast compilation
debug = true

# Project management
cargo new my_app        # Binary project
cargo new --lib my_lib  # Library project
cargo init              # Init in existing directory

# Building
cargo build             # Debug build
cargo build --release   # Optimized build
cargo check             # Fast syntax/type check (no codegen)

# Running and testing
cargo run               # Build and run
cargo run -- arg1 arg2  # Pass args to program
cargo test              # Run all tests
cargo test my_test      # Run matching tests
cargo bench             # Run benchmarks

# Dependencies
cargo add serde --features derive  # Add dependency
cargo remove serde                  # Remove dependency
cargo update                        # Update all deps
cargo outdated                      # See outdated deps

# Documentation
cargo doc --open        # Build and open docs
cargo doc --no-deps     # Just your crate's docs

# Publishing and packaging
cargo login             # Authenticate with crates.io
cargo publish           # Publish to crates.io
cargo package           # Create .crate file

# Useful extras
cargo fmt               # Format code with rustfmt
cargo clippy            # Lint with Clippy
cargo audit             # Check for security vulnerabilities