I find it really difficult to conduct proper studies and notekeeping using online tools. Everything on the internet seems so ephemeral. Websites constantly change, services which store your information blip in and out of existence.

Google RSS Feeds has abruptly disappeared, Google Drive is quite poor for reading PDFs, "Play Books" and Kindle readers have a highlight function but work only for a few formats. I subscribed to a service called Diigo for a while, but it wasn't synced to where I keep to majority of my documents. I also recall a story of someone having their entire audiobook collection erased on a whim by Amazon.

I find all of this absolutely fucking maddening, and have basically defaulted back to paper books and annotating for the majority of my proper in-depth reading and study.

Have any of you mastered this problem of online studying? If so, how? Is it just a matter of paying for a premium service and sticking with it?