My writing issue

I have spent time improving my English, and in all English evaluation exams which I have taken my writing score has been the lowest one. When I write I am unsure as to whether I should write 'the' or not before a noun. I read an explanation about that, but I still don't understand. For example, 'the life is beautiful' or 'life is beautiful'.



I appreciate any correction

**Definite articles such as 'the' are not used before abstract nouns such as 'life'.  So, you can say, "Life is beautiful".