Meem Sakinah is a Meem with no vowel of its own. To decide what happens, look at the very next letter. If it is Ba, one rule. If it is Meem, another. Everything else goes into the third group.
This chapter feels easier than Noon Sakinah because there are only two special trigger letters to remember: ب and م.
The difficulty is not the names. It is controlling the lips so the sound is neither too open nor closed too early.
What is Meem Sakinah?
It is a written م carrying sukun or functioning as a silent Meem in the reading. Because Meem is produced by closing the lips, the three rules are described as shafawi—related to the lips.
Do not confuse a silent Meem with Meem carrying shaddah. A doubled Meem has its own prominent ghunnah and is not classified by looking at the next letter in the same way.

Before Ba: Ikhfa Shafawi
When Meem Sakinah is followed by ب, the rule is Ikhfa Shafawi. The sound is concealed with ghunnah while the lips prepare for Ba.
A common mistake is clamping the lips shut so early that the concealed transition disappears. Another is keeping them so open that the Meem identity is lost. Copy a teacher’s timing rather than forcing the lips.

Before Meem: Idgham Shafawi
When Meem Sakinah is followed by another م, the first merges into the second. The result is a doubled Meem with ghunnah.
Think of one smooth joined sound rather than two separate Meems with a gap between them.

Before the remaining letters: Izhar Shafawi
With the other letters, pronounce the Meem clearly. The transition should be clean and natural.
Teachers often pay extra attention before ف and و because those sounds are also formed near the lips. A beginner can accidentally hide the Meem simply because the mouth is moving quickly.

What your lips should do
Meem gives you helpful physical feedback: the lips are involved in every case. Watch a good model and notice when the lips close and release, not merely whether they close.
Use a mirror if necessary, but do not turn the motion into an exaggerated gesture. Tajweed should remain natural and controlled.
Use a three-column practice method
Make three mental columns: before ب, before م, and before everything else. Collect a few examples from the pages you are currently reading and place each one in a column.
Then recite the examples without naming the rule aloud. The final skill is the sound, not the label.
For the broader obligation and discussion around learning Quran recitation rules, see IslamWeb. The principle of measured recitation is reflected in 73:4 on Quran.com.
If you can remember “Ba, Meem, everything else,” you already have the map. The rest is careful lip timing and repeated listening.