How to best use online resources like w3schoools

I was hoping to get some clarification on the use of online resources like w3schools(dot)com and getbootstrap(dot)/components/ as basis for learning and examples to start with and modify. Is it ok. recommended or bad to use online resources like these? What would be the best approach?

W3Schools has issues but most of the information is ok, if often outdated. Re bootstrap, if you want to use bootstrap then yes use the documentation for bootstrap, you’d have a problem referring to the documentation if you couldn’t look at the documentation. Read the docs, read the source, read the manual, you’ll have great difficulty doing anything if you don’t.