I am little confused about external linking. Is this good or not? If yes then please let me know that why we should do that?
I am also getting confused. Which type of external linking you wants to do? If you wants to promote your website in various websites than go for search engine optimization. It is a easiest and effective way to create backlinks for your website and to get popular on internet.
[FONT="]You are asking about reciprocal linking. If so, link to the quality relevant websites alone.[/FONT]
May be you mean backlinks? If yes, so the rule is the same as for the reciprical ones. Relevant sites with good rating.
If you mean, liking to say Google for the sake of linking to them, i'm not sure that wouldn't hurt you more then help. But if you are on the subject of Google and it's relevant to the subject you're discussing, that might be seen to a human from Google that you do link out to sites that can further the conversion.
i don't think quality external links can be harmful but ya still it should not be in excessive amount
Every quality links are important and you can get the good benefits for your site with the every quality links.