Hello im so confused right now that im stressing myself out lol

I have done link building - i have linked to so many directorys free ones that i dont think there is any left!

I have link exchanged but got told not to do that anymore

titles - doing them now

content - lots of content on my site adding all the time new products

..............................

Blogging: i have never done it is it worth doing and how does it help your site, people are saying it brings links but how??

Articles: what are these and how, i have looked on this site for the past hour reading 101 things about link builsing and im very confused!

can someone help me out please x