There are a few different ways you can earn money from your blog. Google AdSense and Affiliate Marketing are the most reliable ways of earning from your blog. However, You do need to have unique and sufficient content to get most of it.
On the other hand, you have to promote related affiliate products/services. For example- you can not promote pets products from a technology blog. That means your affiliate products/services should be aligned with your blog content.
AdSense Monetization
Monetize your blog by Google AdSense is pretty simple. Just signup for an AdSense account, get the advertisement code (script), and place the code on your blog.
Though creating an AdSense account is super easy but earning a good amount on regular basis may be hard, especially at the beginning stage of your blog. So make sure you have enough visitors to your blog. If you want to learn more about applying for AdSense and about the requirements, see this post.

Affiliate Marketing
It’s another way of monetizing your blog. Affiliate marketing is just recommending products or services to your audiences. There are lots of affiliate opportunities around the web. But make sure you know very well about the product/service which you are recommending to your audience. Otherwise, it will not be fair to recommend the product/service. And it may destroy your reputation by doing so. On the other hand, most of the product/service will have a trial period and you will lose your affiliate commission if anyone got a refund.

Earn money by providing services & consultancy
You can also earn from your blog by providing services and consultancy. Create a service page and contact page on your blog. So your visitors can learn about you & your service, and they can contact you to get paid help from you.

Earn money by selling your blog
This sound may not obvious but you can also earn huge money by selling your blog. If you have sufficient traffics on your blog and it has few earnings, you can sell it to Flipping marketplaces like Empire Flippers, Flippa, etc.

Blogging is one of the trending & easy ways to make passive income. It just takes some time to be eligible earning. Writing your own & unique content is the only & effective solution for it. Though many people are expending their time and effort on Auto Blogging but it has legal issue and it’s not the valid way of earnings. Because it’s equivalent to steal someone’s content. So make sure you are on the right track.
If you have awesome skills, you can earn by freelance work. See another post about how to earn money from Fiverr. If you don’t know, Fiverr is a reliable freelance marketplace and they already have many clients on their platform.