I am a complete beginner.

I'm making the CSS for the page. I have links in the main menu and I created a class for them.

I then went to configure the main text link and noticed that the changes I made to the a tag also affected my menu.

I thought of two ways to solve this problem:

I can create a new class and put all the links in the body, or I can specify that I only want the "a" tag in "main", which way is considered good practice?

main a{
css;
}

or

.links-main{
css;
}

Both solutions are valid and I would like advice from experienced colleagues on what would be a standard approach.