what is the best way to learn english pronunciation

The best method gives you a check you can run alone: a dictionary transcription to compare against, a recording to play back, and one target sound per week rather than a new accent. Accuracy first, speed second, one ending family at a time, because mixing -ed and -s in one week hides which is failing.

Judge a pronunciation resource by what it tells you when you are wrong. A score, a badge or a percentage cannot tell you whether the problem was the vowel, the stress or the ending, and it cannot be acted on. A useful answer names the sound and the position, for example that the last sound of the verb was voiced when it needed to be voiceless. Dictionary audio with IPA, a teacher who can point at the symbol, and a training mode that marks the syllable all meet that test; a bare score does not.

How to Pronounce -ed and -s Endings in English (Three Sound Groups and a Sort Drill) →