Phonemic Chart
A phonemic chart is a visual representation of the sounds in a language. It uses symbols to represent these sounds, known as phonemes.
Here you have an interactive phonemic chart, courtesy of https://englishwithlucy.com, in which you'll get to visualize the symbols representing each vowel and consonant sounds, and also you can interact with the chart by clicking on the symbols, action that will trigger the sounds of each of the phonemes.
This content can be accessed via cellphone, tablet or PC, so you can practice whenever and wherever you want.
Have fun!