You may find some good papers online for Machine Learning, Databases, Statistics, and other relevant topics.
Besides papers, there are also a lot of freely available resources on Data Science that you can use. Intellipaat has a blog on the 25 Best Online Resources To Learn Data Science for free. This blog lists all of the websites where you can find free resources and downloadable materials including seminars and papers. It mentions all the journals that are published to keep enthusiasts and practitioners updated on the world of Data Science as well as different communities that you can join.
Meanwhile, check out this free tutorial on Data Science:
Intellipaat is offering a Data Science Online Course. You can Enroll in this and start learning from anywhere.