Earning by comments will require you to have your own Blogs and Websites. You will then share these dedicated domains (Owned by You) in the comment window. If an option to add your URL or website is not available, then you do not include links. You contact the site support first and get permission to share your URL. Oh, and NEVER share affiliate links in comments.
Blogging is not a writing job; you should take care to keep the content informative and engaging. You as a blogger should not only aim at grabbing the attention of the reader but also get noticed by the search engine to increase rankings. The niche you are focusing on the blog should be targeted with search engine optimized keywords to get higher rankings. And in this way you can earn money money from your home without investing anything. 
If yes, participating in the surveys is the right option for you to earn money online from home. This is, in fact, one of the easiest ways to earn money online without any investment. Many market research companies are looking for survey opinion on their products or service to improve their performance and extend their market reach. These businesses fetch customer opinion through surveys conducted online. As these surveys play a key role in business decision making, they want some genuine opinion shares for the services offered by them.
Take it seriously. Yes, you’re applying for an online job. Yes, you can do the work in your underwear, but that doesn’t mean it’s not a “real job”. You must treat it as such or they aren’t going to treat you as a serious candidate. You aren’t the only one who wants to work in their underwear. In fact, the competition online is likely higher than it is in your local area.
One of the best ways students can earn money quickly is to take paid online surveys. There are plenty of legitimate survey companies or sites that will let you create an account with their sites. If you fit the demographic that a survey is targeting, you will most likely qualify to take that survey.  Some great survey sites that pay cash for taking service are listed here.
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