In my opinion, 'the' is a definite article. It emphasis saying "that one only". Why then 'the' before winter season. There is only one kind of winter season. There cannot be different kind of winter season. For example, the food means that specific food, food - means general. The winter seasons means specific, whereas winter season is not specific, it is general only. I am confused here because someone has corrected me to use the before winter season. Please help.
Rather than seeing the definite article in this usage as indicating a particular winter, I see it as (at least usually) referencing the particular season that is winter.
The hunting season. The holiday season (is when most hoteliers make their money).
The diesel locomotive (can mean 'as opposed to the horse, the electric 'locomotive', the steam locomotive – ie a particular type of motive power – or 'the actual piece of metal I'm talking about').
The floribunda rose (was introduced by the Danish breeder Dines Poulsen in 1907).
This is not a question of semantics, but of syntax.
The word season does not fall in any of the classes of noun which can be used without an determiner (plurals, mass nouns, proper nouns) and so requires a determiner (an article, a demonstrative, a possessive, a quantifier etc). Having a modifier such as Winter before it makes no difference.
Winter itself is different, having some of the characteristics of a proper noun (not all of them: it may take the, whereas typical proper nouns don't).
Typically this is used to describe a particular instance of the season, rather than a particular type of season:
The squirrel here is collecting nuts in preparation for the winter.
In this context, "the winter" means the (unique) next winter season.
There are multiple instances of winter occurring, so the is justified. The indefinite article can also be used in such phrases as:
The crops were ruined by a particularly bitter winter.
In my opinion, 'the' is a definite article. It emphasis saying "that one only".
You can get into trouble learning a rule of thumb about an article, and then going through life assuming that the word is always used in that way, and in that way only.
When I look up the in NOAD, I find six definitions. Surely, then, the article has a wider scope than what was initially expressed in your “opinion.” For example, the third definition reads:
the (article) used to make a generalized reference to something rather than identifying a particular instance : he taught himself to play the violin | worry about the future.
I suspect your use of winter season might have been similar: We need to get some firewood before the winter season. I wouldn't exclude the article in that sentence.
When a word is used by a credible source, and that usage doesn't jibe with your preconceived ideas about that word's meaning, there's a good chance the word can be more widely applied than you initially thought. This seems to be especially true with articles and prepositions, which are mightily flexible little imps.