How does Google position ads on my website?

How do Google ads locate websites? In fact, Google uses their proprietary search technology and web page ranking technology.
To put it simply, I want to take two steps:
The first step is to register an application to join this advertising program-> log on to the Google AdSense website-> select and copy the corresponding AdSense HTML advertising code-> paste the code to the website page. Step 1 is complete.
Step 2: Google uses Google's proprietary search technology and web page ranking technology to place Google ads on webpages that paste ad codes. Step 2 is complete.
From the above two steps, it is not difficult to see that the first step is for website users; the second step is Google's action. That is to say, we only need to do the first step, and the rest will be done by Google. So how does Google implement advertising positioning? The following is the essence of Google's specific positioning content:
Google uses ad code to understand the context and content of a webpage, rather than simply relying on simple keyword matching. Based on deep algorithms that include keyword analysis, word frequency, font size, and overall Web link structure, Google can understand the main content of a webpage, in addition, Google ads can be precisely matched with each page.
Finally, I would like to add that Google's technology can determine the main language of the web page.
If the webpage content is from other countries, such as English, French, German, Italian, Dutch, Portuguese, Japanese, or Spanish, AdSense can advertise the content of the website in the corresponding national language. In addition, Google ads can also be used to locate the location of visitors.