So, there are three types of URLS :
Out of the three, I'm sure the last one i.e. http://site.com/topic-linux would be the best for SEO.
My question is, for ease of development, if I add the forum id along with the URL like this : http://site.com/topic-linux-10 , will it have any adverse effect on the SEO??
Ease of development means, for example, if I have a topic URL like this : http://site.com/topic-hello
Since it is a common topic title, we'll be needing to use http://site.com/topic-hello-1 in the next so, why not use the topic id itself??
Any adverse effect?