Is it still possible to make money just by running ads on a website?

Hey everyone, A few years ago, I met someone who was making **$10K/month** just by running ads on his website. Now that I have some spare time, I was thinking of trying something similar. However, while going through relevant threads, I’ve noticed that most recommendations focus on affiliate marketing rather than ad revenue. So, I wanted to check—**is this still a viable way to make money, or have things changed with Google?** If it’s still possible, I’d really appreciate any **articles, videos, or resources** that could help me get started. Thanks in advance!