This is meant as a quick reference rather than a full lesson, a plain-English rundown of the Tajweed rules that come up most often, so you can look one up when you need a reminder rather than searching through a full course.
Madd (Elongation)
Madd refers to prolonging certain vowel sounds for a set number of counts, usually two, four, or six. The length depends on which type of madd applies and what letter or sign follows it. Getting the count right is one of the more common things beginners rush through.
Noon Sakinah and Tanween Rules
When a noon with no vowel, or a tanween, is followed by certain letters, the sound changes in a specific way: it might merge into the next letter (idgham), be nasalized and softened (ikhfa), stay clearly pronounced (izhar), or drop out with nasalization (iqlab), depending on which letter follows.
Meem Sakinah Rules
A similar set of rules applies to a still meem, though with fewer categories: it can merge with a following meem, be softened before a ba, or stay clearly pronounced in other cases. This is generally considered one of the easier rule sets to pick up once noon sakinah rules are understood.
Qalqalah
Qalqalah applies to a specific set of letters when they carry no vowel, producing a small echoing bounce in the sound rather than a flat stop. It’s subtle, and it’s one of the rules a teacher will often need to demonstrate out loud rather than describe in text.
Waqf (Stopping Signs)
Various signs in the Mushaf indicate where stopping is preferred, permitted, or discouraged. Learning to recognize these signs, and what each one means for whether and how to pause, becomes especially relevant once you’re reciting longer passages rather than short verses.
Using This as a Reference, Not a Replacement
Reading about these rules can explain the logic, but Tajweed is ultimately a sound-based skill, so hearing each rule demonstrated and getting corrected on your own attempt matters more than memorizing the description. Online Quran classes are a more effective way to actually apply these rules correctly than working from a reference sheet alone.
In Short
These five rule categories, madd, noon sakinah, meem sakinah, qalqalah, and waqf, cover most of what comes up in daily recitation. Use this as a quick refresher, but pair it with actual guided practice for the rules to really stick.