Writings and Manuals
You can learn in three different ways:
1. By personal experience.
2. By observation.
3. By studying the experience of others.
You can't experience or observe everything, but you can, by reading, learn from the experiences of your contemporaries, the previous generation, and those who lived ages ago.
After you have accumulated a lot of knowledge about how the world really works, you can become highly effective and achieve many things important to you.
If you're a conservative activist, student, or leader, start here.