The Ethiopian alphabet (Ge'ez) is one of the oldest used in the world. This alphabet is used by many of the 85 Ethiopian languages including Guragigna and Tigrigna.
Each letter/character is phonetic meaning it represents a sound. The Amharic letters are usually portrayed in a grid format with 7 vowels (e, u, ee, a, ae, i, o) going across horizontally and the consonants vertically.
Rated: Non-Essential
Labialized consonants in Amharic are consonant sounds produced with lip-rounding at the same time as the main consonant—almost like adding a gentle "w" to it. For example, think of the rounded lips you make at the start of the English word 'wood'; Amharic applies that same kind of rounding to several other consonants.
These sounds matter because the consonant and its "w"-like quality merge before a vowel, and this distinction can completely change a word's meaning. Mastering them can help with clear pronunciation and accurate understanding of Amharic.
Here's the thing though: you will very rarely use these particular fidel/letters. They're almost forgotten and are hardly heard in modern speech. Realistically, 99.5% of the time you won't encounter or use them. So decide for yourself whether they're worth learning.