Quick answer
Pairs are the cheapest vocabulary you will ever learn: one word gives you two. Watch the negative ones — they need не in the sentence.
Where and when
How much
How it is
The negative half needs не
The rule from the negation page applies to every one of these: the negative word and не travel together.
Typical mistakes
Я никогда́ был в Москве́.
Я никогда́ не был в Москве́.
никогда́ needs не.
далеко́ vs далёкий mixed up
далеко́ = far (adverb)
The adverb ends in -о, the adjective in -ий.
Check yourself
What is the opposite of ра́но?