In this comprehensive lesson from Spanish Boost, Martín guides viewers through the pronunciation of all Spanish vowels and consonants. Starting with the pure sounds of vowels, he explains crucial aspects such as vowel combinations, stress marks (tildes), and special characters like the diéresis. The video covers letter-by-letter pronunciation, including tricky sounds and regional variations for combinations like 'ge/gi' and 'll/y'. This guide aims to help non-native speakers improve their Spanish pronunciation to sound more like native speakers