Where to include conditional logic in WordPress block style templates?

I am trying to rewrite a classic WP theme as a block theme.

Where to include conditional logic in WordPress block style templates?

I am trying to rewrite a classic WP theme as a block theme.

Where to include conditional logic in WordPress block style templates?

I am trying to rewrite a classic WP theme as a block theme.

Where to include conditional logic in WordPress block style templates?

I am trying to rewrite a classic WP theme as a block theme.

Where to include conditional logic in WordPress block style templates?

I am trying to rewrite a classic WP theme as a block theme.