Spanish for English speakers
The points where Spanish and English disagree hard enough that you get them wrong by default — and being told once saves a hundred small failures.
These are not a course in Spanish grammar, which is a book. They are the specific places where your English is actively working against you: where translating what you would say in English produces a sentence that is wrong, or worse, produces one that is right but means something else.
Every rule here comes with minimal pairs — the same words, the distinction visible — because a rule you cannot hear the effect of is a rule you will forget. All of it is drilled in the app, free and without an account.
How to use these
Read one. Not all of them — one, the one covering the mistake you know you make. Then go and produce twenty sentences that use it, out loud, and get them corrected. Reading a rule and being able to apply it under time pressure are separated by exactly that work, and nothing else substitutes for it.
That is what the app is for: it holds a conversation with you, corrects what you say, names the rule you broke, and schedules the sentence to come back days later so you have to produce the fix from memory.