Pronunciation tips (BBC Learning English)
A very useful site for learners as it provides clear explanation of the sounds of English. Remember to check out the radio programmes on the topic of pronunciaton. https://www.bbc.co.uk/learningenglish/features/pronunciation
Authentic American Pronunciation
On this American site by Eva Easton you can practice specific aspects of pronunciation such as linking, stress patterns, contractions, past-tense endings, consonant and vowel sounds, as well as commonly used vocabulary and phrases, etc. There are many sound files for you to listen to and imitate. https://www.evaeaston.com/
Phonics deals with how English spelling relates to pronunciation. It will help improve your spelling as well as your pronunciation, especially in dealing with unfamiliar words when you are reading.