When Reb Shmuel Berenabaum the Roh Yeshiva of the Mir in NY was asked questions about human problems his answer was "Learn Torah" and I would have to say that is about as good an answer I have ever heard about almost all human problems.
Simply put that means to have about an hour per day of learning sessions in order The Old Testament. That is read one page word by word and then put in a place marker and put it down. The pick up a Mishna. Read one page or a few pages with the commentary. Put in a place marker and put it down. Then pick up a Talmud and again read one page with Tosphot the Maharsha and Maharam from Lublin. Then the same with a few session in Physics and Math. That is the light of the Torah that is in the physical world.
If you have done the Talmud a few times then you should also do the Ari. The Ari is mystical but based on a Neo Platonic world view. So together with the Ari it is good to have a session in Jewish Philosophy from the Middle Ages. That is Maimonides's Guide for the Perplexed, Saadia Gaon's Emunot VeDeot, Crescas, Joseph Albo, and the two Abravenel's Isaac and Yehuda, and Ibn Gavirol.
[These people have a lot to tell us but their insights are hidden because of the mediaeval character of their works. It takes some effort to uncover the gems inside them.] [There is an amazing connection between German Idealism and medieval Jewish Philosophy. But this would have to be the subject of a whole new essay. }
No Kabalah after the time of Shabatai Tzvi is kosher. Sometimes knowingly, and sometimes not knowingly it all borrows from Natan of Gaza and brings people that read it into the Sitra Achra. Also there are secular subjects that do not reflect the glory of God and are forbidden to learn . That is almost any secular subject outside of the natural sciences are all from the Sitra Achra. So though I do emphasize certain subjects as being good there are many many more that are seduce people into the Dark Side. Thus we find most religious teachers that read these subjects are in fact agents of the Dark Side. That is the reason I always say to be in a straight Lithuanian yeshiva because every other type is a den of Satan. I am emphasizing the good on purpose.