I am new to coding and I have basic knowledge of it but I am wondering what is the best free online learning platform?
Start with https://google.com, http://php.net, https://google.com, https://github.com/sindresorhus/awesome, https://google.com etc....
Err, well, it depends on what you want to learn/do. HTML/CSS (I learnt it at http://codeacademy.com/web) or JavaScript for websites and PHP somethimes (as @Intyre said http://php.net). There are many more languages to learn apart from this
I think you want to learn the php for PHP for learn html look THAT and google is your friend for that The php is good for doing like member page
PHP.net example they even have [e]books for OOP http://php.net/manual/en/language.oop5.php Stackoverflow for PHP howto do X or just general PHP issue