A phonetic writing writing system, is, unfortunately for English speaker, nothing like English. It is also, contrary to urban legend, very different from Spanish. The only language I can think of off hand that has a phonetic writing system is Korean: the Han'gul system.
In a phonetic system, all the recognized units of sound (English sound 'p', for example, is one that English speakers treat as a single sound, even though we technically have at least two different articulations for 'p') each have their own symbol, based on a symbol-building system, in which symbols are based on the articulatory "components" of the sound.
Typically, one part of the symbol represents what type of sound it is (fricative, vowel, plosive, etc.) while another part of the symbol notes where in the mouth the sound is produced (point of articulation).
The Huri writing system, which, like Greek, became the basis of writing systems for a number of later or unrelated writing systems, is phonetic. It also has a neat feature that I'm fairly certain is unique: diphthongs and consonant clusters are combined into single symbols.
In English, if you have a series of consonants (s-t-r or g-h-t, for example) they must be written as a series. In Huri such a series is written as a single unit.
This means that most words have only a few characters. On the other hand, it means there are lots of characters that you have to memorize. Fortunately, these characters are based on a system that actually makes sense, which helps your memory.
First, here is a basic breakdown of the Huri system.
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Now, a breakdown of that image.
Sound Marker (SM): This line is the backbone of all the characters. Beyond that, it's pretty self explanatory, as you'll see.
Vowel Marker (VM): When placed with the SM, it indicates a vowel.
Long Vowel Marker (LVM:) When placed with the SM, it indicates a long vowel.
Nasal Marker (NM): When placed with the SM, it indicates a nasal consonant.
Fricative Marker (FM): When placed with the SM, it indicates a fricative consonant.
Aspirant Marker (AM): When placed with the SM, it indicates an aspirated plosive consonant.
Unaspirant Marker (UM): When placed with the SM, it indicates an unaspirated plosive consonant.
Ejective Marker (EM): When placed with SM, it indicates an ejective consonant.
The circle next to the SM under Positional Meanings shows you what the position of a marker indicates. For example, placing the vowel mark in the bottom left of the SM gives you a front-high vowel (e).
The actual symbols will help you see what's going on. For example, you will noticed that the LVM can be placed at different angles, or that the angles of the NM can change, based on position.
Next, I'll show you how to make diphthongs (a series of two vowels, pronounced together).
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Here, you can see that you create diphthongs simply be combining the symbols of the two vowels you are putting together.
Note that there is an new symbol, shown in the center of the page.
Directionality Marker (DM): it helps us tell the difference between pairs, like OA and AO, which would like the same without the DM.
Short Diphthongs (SD): combinations of two short vowels.
Long Diphthongs (LD): combinations of two long vowels.
Semi-short Diphthongs (SSD): a short vowel followed by a long vowel.
Semi-long Diphthongs (SLD): a long vowel followed by a short vowel.
You can easily tell the difference between this groups: SD has only dots, LD has no dots, and in SSD and SLD the DM is always on the same side.
I will be editing this post to include and explain consonant clusters later, but I haven't finished that part yet.