Is there any rule in the change of English verbs, adjectives and nouns? What is it? Feel a lot of English words (adjectives, verbs) into nouns just add a suffix, the suffix addition is not regular? I'm going crazy!

Is there any rule in the change of English verbs, adjectives and nouns? What is it? Feel a lot of English words (adjectives, verbs) into nouns just add a suffix, the suffix addition is not regular? I'm going crazy!

After the verb, add Er or or, become the action executor, such as: worker, visitor. After the verb, add ion, become a noun, such as: operate -- operation. After the adjective, add ness, become a noun, such as: illness, kindness