When you get stuck on a problem, nine times out of ten it's not that you're dumb—it's that the explanation is wrong. Put two explanations of the same set of concepts side by side, and the problem becomes obvious.
The textbook's way: definitions come first, and one sentence is worth ten thousand; symbols are abstract—you know every letter, but not the combination; formulas are given directly, with a passing word about where they come from; and as for examples—please refer to the end-of-chapter exercises.
A different way: start with examples to build intuition, then introduce definitions; break formulas down into "what each term is doing"; use everyday analogies to establish the picture first.
The textbook isn't wrong. It's written as a reference book for people who already have a foundation, and it assumes you'll fill in the intuition yourself. For an ordinary person encountering a concept for the first time, what's missing is exactly that layer of intuition.
A three-step solution when you get stuck
Step one: ask about the exact place where you're stuck. Don't ask "How do I do this problem?" Ask "What is this concept actually saying?"—bring the question down to the conceptual level, and the answer will have reusable value. You can throw the question directly to muchsci; concept explanations are one of its standard features.
Step two: ask for an explanation in plain language. Give it to muchsci: "Explain the concept of XX in plain terms, with an example." It explains by combining authoritative search results rather than making things up—this matters a lot in concept learning, because a wrong first impression is hard to correct later.
Step three: go back and read the textbook again. With intuition as a foundation, when you turn to the definition again, you'll realize this page was talking about exactly this. The textbook turns from gibberish back into a reference book.
Three stuck moments, three prompts
Stuck during preview: "Explain the concept of XX in plain terms, with an example"—establish the picture first before class, and your listening efficiency will be completely different.
Stuck on a problem: "What does each term in this formula mean? When do I use it?"—this is far more useful than asking for the answer directly; next time the numbers change, you'll still be able to do it.
Cramming before an exam: "Compare and explain the concepts in these chapters that are easy to confuse"—understanding confusing concepts in pairs is much more solid than memorizing them one by one.
Get the place where you're stuck clarified on the spot—don't leave it overnight. The greatest value of tools like muchsci is that they reduce the psychological cost of "asking out loud" to almost zero—concept learning debt compounds, and if you're vague about one "eigenvalue" today, the entire exam paper next month will come to collect.