The 28 hijaiyah letters and their four positional shapes
The Arabic alphabet has 28 basic letters. Teachers in Indonesia often count 29 or 30, because hamza and lam-alif get their own entries in the chart. Every letter is a consonant; short vowels are written as small marks above or below the letter. Script runs from right to left, and most letters have four forms: standing alone, at the start of a word, in the middle and at the end. The small ha (Ù‡) catches many beginners out, since its initial and medial forms look nothing like the isolated one.
Six letters never join to the letter after them: alif, dal, dhal, ra, zay and waw. A word can therefore look broken in the middle while still being one word, and learners who know these six from day one split words wrongly far less often. The second hurdle is the family of letters that share a skeleton and differ only in their dots: ba, ta, tha, nun and ya at the start of a word; jim, the breathy ha and kha; dal and dhal; ra and zay; sin and shin; sad and dad; ta' and za'; 'ain and ghain.
The most useful drill is to group letters by skeleton, then write each one in all four positions across a single line of the notebook. After that, the learner reads short words and points to where each letter sits inside them. This stage has settled when any letter can be recognised in the middle of a word without checking the chart, including the ones that differ only in the number or placement of dots.
Group letters by skeleton and dots, then write all four shapes by hand; an eye that knows the skeletons recognises whole words faster.