I swear by the W3Schools How to Snippets. In fact, in my web publishing work, that's where I go to learn something new. And if you find some code there, you know it's been thoroughly tested across platforms.
And complementing that is a coding platform that produces applications for the desktop. So you can take your HTML and CSS frameworks, merge them with data tables, and post it all online.
For that purpose I use Visual Foxpro (VFP). And even though Microsoft no longer supports VFP, there's a huge international online community of experts who can keep you out of trouble -- and who are happy to provide free advice.
I got started with VFP about 15 years ago, and I am constantly finding uses for it in my boutique publishing stuff. There's even an outstanding series of low cost training videos by a very competent and pleasant-to-listen-to guy in Toronto. Using that training course filled in the gaps on how to get rolling.
Thanks for those tips, I have bookmarked it, FRiend...