Here's a picture of the Romaji/Heburn system phoneme mapping to Hiragana:
Here's an AI-generated answer that the Brave browser gave me:
Types of Japanese Script
The Japanese writing system consists of three primary scripts: Kanji, Hiragana, and Katakana. Kanji are logographic characters derived from Chinese writing, used to represent nouns, verb stems, adjectives, and other core content words, with each character conveying meaning and often multiple pronunciations Hiragana is a phonetic syllabary with curvaceous, flowing shapes, used for native Japanese grammatical elements, particles, verb and adjective endings, and words not represented by Kanji Katakana, with its more angular and straight-lined appearance, is also a phonetic syllabary used primarily for foreign loanwords, scientific terms, onomatopoeia, names of plants and animals, and for emphasis These three scripts are typically used together in written Japanese to create a balanced and efficient system, with Kanji providing meaning, Hiragana handling grammar, and Katakana highlighting foreign or specialized vocabulary
Here's a picture of a Japanese sentence that illustrates what the AI said above.