Using Google Tag Manager for embed codes on blog – how?

Hi,

I want to learn Google Tag Manager for placing codes on my rebuilt site. The types of codes I want to include are the typical copy-paste and embed codes like:
– Google Analytics
– Add This (social bookmarking icons appearing above the article)
– Disqus (commenting system)
– …potentially others as well

My dilemma is:

I know that Google Tag Manager can include sitewide codes (like: everywhere on the site), such as Google Analytics, which are invisible anyway. But: can I chose where a…

Using Google Tag Manager for embed codes on blog – how?