i basically want my blog http://www.my-oil-painting-techniques.com to do well in the search engines.

i dont quite know how to optimize a blog site and wondering if the category name(ones that would go along the menu bar) needs to be a profitable keyword, because its hard for me to make sense if i use the profitable keyword for category names.

so im wondering if it would be alright to just use non-profitable words to be the names for my category, such as, "portrait/figurative", "still life","landscape","tutorial",
but then my link would be something like mydomain/landscape.com and the word landscape is not at all a profitable keyword for me. a profitable keyword is "oil-painting-techniques" but i do not want my category names to be like "still life oil painting techniques"" landscape oil painting techniques" as they are too long and id probably run out of room on the menu bar.

thanks again and if there is anything else you can suggest to me to improve my site for search engine ranking, please let me know.