PHP
Customizer settings – functions
If you want customizer option not ACF options, then inside the after_theme_setup add these. Setting a custom background colour:...
Image sizes – functions
add image sizes inside after_theme_setup Allow featured imagess: setting up additional image sizes (only use if required in the...
Additional Functions php
Support JSON mimes type: Support SVG mimes type: or use the SVG support plugin can be useful to add...
General Functions php
Register a widget area (inside after_setup_theme)