A "simple guide" shouldn't overwhelm you with gear, but it should point you toward the right tools. For the best experience, you generally need three things:

Cross-Hatching: Overlapping parallel lines at different angles. This is the cornerstone of creating deep, rich textures.

Portability: Keep your entire reference library on a Kindle or tablet while you draw in a park or café.

Searchability: Instantly find specific techniques like cross-hatching or stippling without flipping through physical pages.

Zoom Capability: High-resolution digital guides allow you to zoom in on intricate line work to see exactly how the artist layered their strokes. Core Techniques Covered in the Guide

A Graphite Pencil: Even the best ink artists usually start with a very light pencil sketch to map out proportions before committing to permanent ink. How to Practice for Better Results

Contour Lines: Using the direction of your strokes to describe the 3D shape of an object, rather than just its outline. Essential Tools for Success