Hello! We'll learn about German adjective comparison: Comparative and Superlative forms. They help compare things or express the highest degree.
The Comparative ('more') adds '-er' to the adjective; e.g., schnell (fast) becomes schneller (faster). The Superlative ('most') uses 'am' with '-sten', like am schnellsten (the fastest). Note that some, like groß (big), change vowels: größer, am größten.
These simple rules get easier with practice. Good luck!