The only correct grammar rule, using examples from the t...

adverbs of frequency are always used after verbs, as in it is often under-appreciated… (line 02).

adjectives can be used in a noun position after verbs as in feel good (line 07).

the use of whether and if is interchangeable, as in whether it is to teach or (line 08).

abstract nouns like knowledge (line 01) and understanding (line 02) are not preceded by indefinite articles.

the prefix out- , as in outweigh (line 10), always gives a verb the meaning of bigger.