W3Schools is a widely recognized online learning platform that offers tutorials and resources for a vast array of programming languages. W3Schools has a very user-friendly approach and presents its information in an easy to understand manner making it excellent for beginners and intermediate learners. It also covers all of the languages mentioned previously and many more. The website is a great tool to help practice coding syntax in it’s built in coding environments for each language as well.
Youtuber thenewboston has a series of good C++ and Java tutorials ranging in skill level. Below are two Java Tutorial playlists, one at a beginner level and one at an intermediate level as well as one C++ playlist.
Here is a beginner crash course video on Python by thenewboston as well: