Chocolate

I like a chocolate, especially(no a) dark chocolate.When I was a child, my mother work(worked) in the confectionery factory.Аs a matter of fact she worked as a book-keeper, but when I came everyone treated me somethings sweets(with something sweet). From those times I like a chocolate, it remind(reminds) me of my childhood. It's (a) sweet memory.

When chocolate is a generic noun (when we are talking about all chocolate, not a specific chocolate candy bar, this bag of chocolate chips, etc.), then we usually do not need "a" or "the" before "chocolate."  For example:  Do you like chocolate?  Yes, but chocolate is expensive. 

If we are talking about a specific chocolate (this chocolate bar, those pieces of chocolate), then we will often add "a" or "the" before the word "chocolate."  For example:   "Would you like a chocolate?  (said while offering a piece of chocolate from a box of candy).  Oh no, the chocolate melted because it was hot outside!"

Good job with your writing -- only some small changes are needed.

And I agree with you -- dark chocolate is the best!   :-)

~~~~~

Chocolate

I like a  chocolate, especially  a  dark chocolate. When I was a child, my mother worked in the confectionery factory. Аs a matter of fact, she worked as a book-keeper, but when I came everyone treated me to somethings sweets. From those times I like a  chocolate (suggestion: "Ever since then I have liked chocolate"), it reminds me of my childhood. It's a sweet memory.