here are to follow list :
1- online advertising
2- adsense
3- media.net
4- chitika
5- affilate marketing
6- email marketing
7- niche website
8- writing free lance
9- search engine optimization or seo
10- promoting click bank products
11- promoting amazon products
12- promoting commission junction products
13- promoting digireult products
14- simple virtual assistance job
15- cash back
here are the essential point of view in detail
1- online advertising
online marketing is one of the simplest way to make money on internet. this is specially true if you have yet to earn your first passive income online. to make good income with this type of advertising , it require a lot traffic through your site., it is gained small amount by click or visitor. visit more site
2- adsense
with google adsense , you can earn passive online income from your site by showing ads are relevant to your site and visitor.visit more site
3- Media.net
It is similar to Adsense, it is the Yahoo,bing network 's answer to Adsense ads and is the second large contextual advertising company in the world. visit more site
4- chitika
Chitika is similar to Adsense and Media.net, they are one of the popular alternative ads network to adsense and have low minimum pay out thesold .
5- Affiliate marketing
Affiliate internet marketing has been sound almost as long as the internet, and this is one of the best and easies way to earn some passive income.
6- Email marketing
To be successful with email marketing, if done correctly and tastefully, though ,this can be a very successful methods of marketing because you are sending to people who know you and are receptive to you and your niche.
7- Niche Website
Niche website are a sound and successful way to make a good income if you have a specialty products and services.
8- writing free lance
people who are good at writing or who enjoy writing article ,blogs, and short stories or just like writing in general , about any topic. good quality content that they may be able to sell on site like upwork, freelancer, ehow , about.com and yahoo.
9- Search engine Optimization (SEO)
those people who have a working knowledge about or anyone who take time to learn seo , which is how search engine or website work, in style that optimize engine search such as keywords, keyword ,synonyms, title tag , headers , bullets, etc.
10- promoting click bank products
click bank is now the biggest digital products marketplace online. one of the measures it use is called ' gravity ' to represent how well a products sell.
11- promoting amazon products
the amazon affiliate program is really good way to promote physical products, through a reliable, trustworthy , and well know online store.
12- promoting commission junction products
commission junction is one oldest and largest affiliate networks on the internet today. most of their merchants are well established .
13- promoting digiresults products
online business and internet marketing products are the main things digiresults focus on , they also have products ranging from health and fitness to travel.
14- simple virtue assistant jobs
although this is not strictly passive income are good because you get paid for doing simple task online.
15- cash back
this is a great way to get rewarded for purchasing or using products you plan to buy anyway. cash back sites pay you when you click through them, go to retailers , and spend. there are over 2,000 stores that offer cask back including walmart, target, sears , calvin klein and others.