Kernowek Qwyck ('Quick Cornish') is a no-frills taster course in Cornish that can be downloaded free of charge. It currently comprises 15 lessons, taking you with just a small vocabulary about halfway through the grammar for Common European Framework of Reference for Languages Level A1 (Breakthrough). Every exercise is reversible, so you can check your own work. A guideline pronunciation is given for each vocabulary item.
Kernowek Qwyck is fully compatible with the coursebooks Desky Kernowek and Cara Kernowek 1 and with Cornish classes run by lovinglivingcornish.
Each lesson has been formatted so it may be printed on both sides of a single sheet of A4 paper.
Click here for the pdf.
Here is a link to a more comprehensive guide to pronunciation.
Here is a link to Cara Kernowek 1, a complete coursebook for beginners.