Affiliate marketing is another way to make some income on your blog, however it takes a lot of work and you will need to have a big following. One very successful blog that utilizes affiliate marketing is www.snobessentials.com
Basically, you sign up as an affiliate, in my case I use www.commissionfactory.com.au and joined a few programs. These affiliate companies then provide you with a tracking code so that if anyone clicks the link or the photo that has your tracking code, and purchases a product, even 30 days after the original click you earn a commission. Be careful not to have too many affiliate links in your blog though as Google may pick it up as spammy.
You can use your designated affiliate link in your social media too by shortening it with Hootsuite, Buffer of bit.ly and writing a catchy sentence.
You will need to have a big following and an engaged audience to make decent money from affiliate marketing.
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I use affilate marketing more for selling lifestyle products such as fashion and homewares. Sometimes I will write a blog post and include links to products I like and sometimes I will just drop a banner in the post (like below) which is supplied by the affilate program. I only use two affiliate programs for this type of promotion which is Commission Factory and Referboard www.referboard.com - both these programs also have extensions for Google Chrome that make referring retailers products easy.
For coaching on Affiliate Marketing please contact firstname.lastname@example.org
Note I have put quite a few affiliate links on this post as examples, so if you do purchase something I will make a small commission. This is a disclaimer which is another point you must be aware of.