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The word "best" is an adjective, and adjectives do not take articles by themselves. Because the noun car is modified by the superlative adjective best, and because this makes the noun car definite in this context, we use the. It is best not to do something. Here, we have the adjective best, but this adjective is attached to no noun. Toronto is cool. Toronto is a BIG city with a population over 2. Best Things to Do in Toronto this February">16 of the Best Things to Do in Toronto this February
In the following sentence, however, best is an adjective: "What was best?" If we insert the word the, we get a noun phrase, the best. You could certainly declare that after comparing a number of things, you found that a particular one of those things was the best. That is to say, it was better than any of the others. Closet Monster is a distinctively offbeat and emotionally striking coming-of-age story about a creative teenager desperate to escape his hometown and the haunting memories of his turbulent childhood. Every Tuesday at Wildseed, we create space to move, learn, and connect through workshops that center joy, embodiment, and community care. Adverbs
Both sentences could mean the same thing, however I like you best. I like chocolate best, better than anything else can be used when what one is choosing from is not specified I like you the best. Between chocolate, vanilla, and strawberry, I like vanilla the best can be used when choosing from some choices. Toronto is an exciting city in Canada to visit. It has over 40 million visitors each year and is home to 8, restaurants and bars. Best Things to Do in Toronto, Canada
"Which one is the best" is obviously a question format, so it makes sense that " which one the best is " should be the correct form. This is very good instinct, and you could even argue that the grammar is good, but at best it's unnatural. . 
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So, " It is the best ever " means it's the best of all time, up to the present. " It was the best ever " means either it was the best up to that point in time, and a better one may have happened since then, or it includes up to the present. .
Definite article
1 Your example already shows how to use "best" as an adverb. It is also a superlative, like "greatest", or "highest", so just as you would use it as an adjective to show that something is the ultimate example of it's kind when used as an adverb you do so to indicate that the adjective it precedes is to the highest degree possible. .
Articles
I mean here "You are the best at tennis" "and "you are best at tennis", "choose the book you like the best or best" both of them can have different meanings but "most" and another adverb in a standalone sentence has a completely different meaning. .
Grammar
It's best that he bought it yesterday. or It's good that he bought it yesterday. 2a has a quite different meaning, implying that what is being approved of is not that the purchase be made, but that he is the one to make it. 3 "It's best (if) he (not) buy it tomorrow." is not a subjunctive form, and some options do not work well. .