So, you would like to promote a website to make money online. First of all deliberate thoroughly how you are going to make money with your website? There are a lot of ways. Some of them may be:
The first rule for choosing the subject for your website is your strong interest to the subject. There are a lot of pages for each subject over there but only those written by authors really interested in the subject manage to be the most visited.
Please be aware that you have to invest a lot of time into the website in order to be able to earn more than $1 per day. If you are not interested in the subject you will not manage to gather interesting information, write articles or just discuss about it. At the beginning you will not earn anything and the only motivation you have is just to be busy with favourite subject.
On the other side the favourite subject is not the obligatory the lucrative one. You have to figure out answers to 3 questions concerning it:
All these questions can be answered by using https://adwords.google.com/select/KeywordToolExternal. Combine Estimated Avg. CPC, Advertiser Competition and Global Monthly Search Volume to figure out the best combination. Do not start on high competitive keywords, but pay attention to number of searches. The best combination is competition of about 0.6 and cumulated search volume of about 30000 searches monthly. Then pay attention to CPC to figure out if you will be able to earn with it.
Pick up to 10 search words, concentrate on them and do not change them to see undistorted progress of your work.