Comparison

1. ADJ

1.1. Comparative

1.1.1. ADJ + ER

1.2. Superlative

1.2.1. ADJ + THE EST

2. Spelling

2.1. Big -> Bigger -> The Biggest

2.2. Happy -> Happier -> The Happiest

3. But...

3.1. little -> less -> the least

3.2. good -> better -> the best

3.3. far -> further -> the furthest

3.4. much/many -> more -> the most

3.5. bad -> worse -> the worst

4. ADJ

4.1. Comparative: More + ADJ

4.2. Superlative: The most +ADJ