A lot. The certification is a certification, you must create a portfolio of sites or programs to Github to prove that you know.
There are a lot of online schools. You can be certified for many like:
- WordPress
- Joomla
- Drupal
- CodeIgniter
- Laravel
- PHP
- HTML
- CSS
- MYSQL
- JS
- Photoshop
- Gimp
- Magento
- Moodle
- and more
and more. There are technical sites and university sites. I have followed courses from the:
- OStraining (CSM tech)
- Joomlashack (Joomla)
- VTC (good summary courses)
- Eduonix
- Udemy (pay and have the course forever + updates)
You must decide your area, check the market, and study.
