If I want robots to index all my pages, I need to put robots.txt in main directory of website? is there some differece to rank site higher, when I have robots.txt file or not?
I include the robots.txt even if I am not going to disallow anything because search engine spiders will be looking for the file.
There is no problem with that... as long as you don't put any dis allow command... Allow all spiders to index everything: User-agent: * Disallow:
I am using it and blocking some of my content from being indexed in order to avoid duplicate content...it depends on each site.
I use one and dissallow nothing (except a bad spider that found my sites) but otherwise, liked having one just to avoid the 404's. If you dont really want to get too involved with a robots.txt, just do as pedring said and move on. Good luck with your sites.