How to choose defer parsing javascript

https://codex.www.ads-software.com/Conditional_Tags

Thanks for the response, could you elaborate a little about conditional tags? i didnt see anything that had to do with code above

for example:

if( is_front_page() ){
    wp_enqueue_script('global', 'https://www.xertionfitness.com/.../global.js');
}

More examples:
Load script in header

function load_header_scripts(){
     wp_enqueue_script('global', 'https://www.xertionfitness.com/.../global.js');
}
add_action('init', 'load_header_scripts');

Load script in footer

function load_footer_scripts(){
    wp_enqueue_script('global', 'https://www.xertionfitness.com/.../global.js', false, false, true);
}
add_action('init', 'load_footer_scripts')

Both of these will be loaded at the same time on the server, but on the front end will be loaded at different times in the browser.

Thanks you so much, i kinda understand now. Can you answer this for me, Whats the difference if i use the format above or if i use w3tc and minify the code manaully in the js section? Why do the code above work better? just curious. Where do i put the code? in header, function, index php?

To add more code to function I just

function load_footer_scripts(){
wp_enqueue_script(‘global’, ‘https://www.xertionfitness.com/…/global.js’, false, false, true);
wp_enqueue_script(‘global’, ‘https://www.xertionfitness.com/…/s2member-o.php?);
}
add_action(‘init’, ‘load_footer_scripts’)

In the footer example, what is the false, false, true about?You didnt put it in the other codes?