The forums ran from 2008-2020 and are now closed and viewable here as an archive.
Home › Forums › Back End › WordPress add_filter location › Re: WordPress add_filter location
Do you have an example of what you’re talking about? Perhaps a live site, or some code we can work with.
Frontend Masters is the best place to get it. They have courses on all the most important front-end technologies, from React to CSS, from Vue to D3, and beyond with Node.js and Full Stack.