What is the code for showing Custom Category and Subcategory Page?

I found 2 ways for my problem :

1- you can create a file with name “category.php” for all of your categories and then for every category that you want to add a diffrent style you should create a file like this>> “category-id.php” OR “category-name.php” .

2- another way is that you can do this work by if and else , you should use this code :

<?php if (in_category('name')) {
     echo 'htmlcode';
}
elseif (in_category('name-2')) {
     echo 'htmlcode';
}
else {
     echo 'htmlcode';
}
?>