There are no any kind of tool that provide you information about by which update your site get penelised. Only web master tool provide you accurate information in security isseue and manual actions column.
Forum is a best way for share your knowledge with registered member that very useful to others. It provide plateform in which member ask particular question in relevant category and get answer by member respectively.
There are many blogs and article available on net that helps you to learn about SEO.
Forum posting and blog commenting is a best way for link building. By this method, you instantly get backlink. Link exchange is also method but after google algorythem update, those link are not benificial to our site.