I have benefited from a wide range of expert knowledge available on the web, but there are a lot of poor quality websites too.
Here are a number of useful pages that I would recommend
Osentia - Fracture risk assessment based on fingernail clipping.
Kerus - Cutting edge software for designing complex real-world clinical studies in biomedical science.
Web Resources for Data Science
Journal of Raman Spectroscopy - premier resource for Raman spectroscopy
Research Gate - social media platform for scientific researchers
Mendeley - open source tools for the academic community, including citation manager
Publons - track contributions to peer review
Google Scholar - search for scientific literature without an institutional account
Vasser Stats - useful resource for statistics, guides and basic calculators
MedCalc - Similar to Vasser Stats, gives another perspective
Matlab Central - Community for Matlab users, forum and file sharing.
Stack Exchange - forums for all manner of technical disciplinces, including programming, statistics and science.