Some helpful resources (not in any order);

• http://www.damtp.cam.ac.uk/user/tong/teaching.html ~ David Tong's lectures are good for reading about physics in a serious way.

• https://www.goodtheorist.science/ ~ For young people who want to become physicists, by Gerard 't Hooft.

• https://physicstoday.scitation.org/doi/10.1063/1.2808904 ~ All I Really Need to Know… by David P. Stern

• https://www.mccurley.org/advice/hamming_advice.html ~ Hamming's advice for research (disagree with some here).

• RÉSONAANCES ~ A good blog for keeping an eye on high-energy physics (experiments).

• https://bhavana.org.in/

• Resonance ~ A journal for light reading.

• Crackpot index ~ Feel free to calculate it.

• http://insti.physics.sunysb.edu/~siegel/quack.html 

• https://physics.stackexchange.com/ 

• https://math.stackexchange.com/, https://mathoverflow.net/ ~ Mathematics counterparts.

• https://math.ucr.edu/home/baez/physics/Administrivia/booklist.html ~ Booklist.

• http://library.msri.org/books/sga/sga/pdf/index.html ~ Grothendieck SGA Lectures

• https://stacks.math.columbia.edu/browse ~ The Stacks project

• https://webspace.science.uu.nl/~hooft101/GtH_lectures.html ~ Some more lecture notes.

• http://www.hri.res.in/~sen/ ~ By Ashoke Sen, lecture notes by him.

• https://www.ams.org/open-math-notes ~ Open Math Notes.

• https://theoreticalminimum.com/ ~ Susskind's lectures.

• https://dlmf.nist.gov/

• http://theor.jinr.ru/~alvladim/lit.html

• https://automorphic.jh.edu/

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• Physics Notes by me.