Ctrl+Paint - Digital Sketching: Technical Drawing
https://ctrlpaint.myshopify.com/collections/essential-skills/products/digital-sketching-4-technical-drawing

Freehand sketching is an important skill, but even it has limits.  When industrial designers sketch mechanical subject matter they use rulers and ellipse templates.   Even though your canvas is digital, you have access to equally powerful tools.  This series showcases a straightforward approach to clean, technical, lines in Photoshop.  Starting with simple objects and examples, it helps you master vector tools which artists commonly avoid - leading you toward fast and efficient line work.