About fashion

Half of a year ago I decided to take a course in fashion styling. In Russia people have a reputation for dressing well and I always want to be trendy. That's why I decided that this course is necessary for me. I always pay attention to my appearance. I like to wear  dress smart, but I don't dress in an eccentric way. I have never judged others for how they dress. I just wanted to find my own style.
This course was very useful for me. I gained a lot of knowledge about the latest trends of fashion. I knew what kind of dresses and skirts really suit me. I knew that a bag could match not only shoes but also your scarf, chaplet or rings, I mean not only shoes. After the end of the course I had the desired to dress up appropriately and went to the for a restaurant. Now when I want to go somewhere I always remember what I was taught about and try to get dressed stylishly.

I hope I helped with my corrections. 

About fashion

Six months ago, I decided to take a course....

In British English we don't use 'half a year ago'. If it is less than a year, you generally express this amount of time in months. (3 months ago, 9 months ago...). If it is more than a year, you can use it (a year and a half ago, three and a half years ago ...)

About fashion

Half a year ago I decided to take a course in fashion styling. In Russia people have a reputation for dressing well. Since, I always want to look trendy, I decided that I should follow this course. I always pay attention to my appearance. I like to dress smart, but not eccentrically. I have never judged others on how they dress. But I wanted to find my style.
This course was very useful for me. I learned a lot about the latest fashion trends. I now know what kind of dresses and skirts really suit me. I know that a bag could match your scarf, chaplet or rings. It matches more than just shoes. At the end of the course I felt like dressing up appropriately and going to the restaurant. Now when I want to go somewhere I always remember what I was taught and try to dress with style.

I changed somethings that were not wrong, but sound more natural with my suggestions.