Irish Broad and Slender Consonants Guide
For my fellow daltaí Gaeilge who have trouble with the difference between broad and slender consonants, I found this link to be extremely helpful in understanding it clearly: ( http://www.smo.uhi.ac.uk/gaeilge/donncha/focal/features/irishsp.html ). Just scroll to where it says "III. The Consonants".
Awesome, now I am not butchering the word "fir".