Interactive pronunciation book
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These are the symbols you will see in a dictionary. Click any one to hear it. You do not need to memorize them.
At the start of a stressed word, English p, t and k come with a small puff of air. Without it, an American may hear your p as b, your t as d, and your k as g. Pin becomes bin. Coat becomes goat.
This surprises people, because you are saying the right consonant. The problem is that English listeners use the puff, not the consonant itself, to decide which one they heard.
Spanish, Italian, Portuguese, French, Russian and many others produce p, t and k with no aspiration at all. Your consonants are clean and correct in your own system, and they land as b, d and g in English ears.
If your language does puff, this unit will be quick for you.
Add a small breath immediately after the consonant, at the start of a stressed word. The picture: a tiny sigh riding out on the consonant.
The test is physical and settles the question immediately. Hold a tissue in front of your mouth and say pin, top, cake. The tissue should move. Say spin, stop, skate and it should barely move at all, because English does not puff after s.
That contrast is also the fastest way to feel the difference in your own mouth. Pin and spin contain the same p, produced two different ways.
Hold a tissue in front of your mouth and say pin, top, cake. The tissue should move. Say spin, and it should barely move at all.

I play one word. Tap the one you heard. No speaking yet, just listening.
Play each pair deliberately and feel the one difference. This is where the sound stops being abstract.
Pick anything above, then record yourself saying it. Your recording appears in red over the model in gray. You are comparing shapes, not chasing a score.
You say p correctly, so why does an American hear bin when you say pin?