Take for example this random question Tool or plugin required to show out in which html files a given css selectors is used, notice that the relevant part is
Now, it being possible that the url could have been done like this :
That is the question_id is after the question, and what comes first in a url weighs more in seo, why is the question part coming after the question_id.
I also read in an article that only the first two subdirectories are relevant therefore only
/question/16999 is relevant. Looking at SO this is definitely not true, but I can't decide on the weigh of this.
I am asking because I am going to implement seo optimizations and don't want to have to change the link to my pages afterwards.