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IMO, both are must for traffic plus PR because forums are producing good backlinks and mostly do-follow. Blog commenting helps to increase your site PR and traffic so you should do both for your site.

Well, it is the process of getting traffic from the “free,” “organic,” “editorial” or “natural” listings on search engines.

Link exchange is no more after Penguin so you have to avoid these all paid or exchangeable links which you do for increasing traffic and PR.

It will give you quality back links and this will increase your traffic and page rank. You have to find blogs where the comments are accepted and to be on topic. Do not spam.

IMO, both are good for promoting your site. Forums are most important because it can approve your comment instantly but you have to wait for approval of blog owner.

If you want to get rank on Google so you have to make maximum backlinks on different resources such as blogs, forums, directories etc.

Well, Google plus is simply a social media site just like facebook and twitter which is made by Google corporation.

Google backlinks are those which can maintain your rank on Google search engine. Try to make maximum backlinks for your site on different resources such as blogs, forums, social bookmarking,...

Well, you should maintain first your blog or site because Google didn't approve any site where content is not unique. After approval you should include its ads on your site which can be earn for you.

If you want to approve your adsense then you should maintain your blog well because Google didn’t approve any blog which have copy paste materials.