Including Google AdSense on your site is just one way to make money from online advertising.
Another way is simply to sell your own advertising space directly to companies looking to sponsor different blogs. For example, you could write the specific price for each space you sell, such as the following banner: „side ad space, banner type that costs $ xxx per month.“
You will be paid depending on how many visitors you have. Basically, the cost offered for this type of advertising is one dollar per thousand impressions (or CPM). As an example, you might see it as: 4.51 € CPM. If the website receives 100,000 visits per month, then the cost of advertising will be € 450.86.
The good thing about this approach is that if your site receives tons of traffic from different sources, just one simple banner ad can earn you good money a month! However, the obvious downside to this approach is that if your site does not receive a lot of traffic, then you cannot expect to earn much.
Another common method when selling ad space directly from your website is at a regular direct price. Here, you just set one specific price (based on your estimate of how much it can cost, and what the competition offers). This price is simply a fee and is not tied to a cost-per-click like AdSense