Custom Theme, Custom shortcode not working

I would recommend using single quotes if you want to include some HTML, also you need to return something otherwise nothing happens.

// WP Shortcode
function text_shortcode() {
    return '<strong>bold text:</strong> <a href="https://wordpress.stackexchange.com/questions/318934/shortcode-returns-escaped-html-tags">See wordpress.stackexchange.com</a>';
}
add_shortcode('bold-text', 'text_shortcode');

Your WordPress shortcode would be:

[bold-text]

See my other answers with examples:
– Shortcode created to check language not works
– Shortcode returns escaped HTML tags

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