اللَّهُ – Laam of Allah Muffakhm Laam because is preceded by Fatha .
أَحَدٌ – Qalqalah in (د) , There are five Qalqalah Letters ( ق – ط- ب- -ج – د ) .
الصَّمَدُ – Laam is Shimsyyia, There are 14 letters if Laam Definition is Followed by one of them should not pronounce it.
يَكُنْ لَهُ – Noon Sakinah is Followed by (ل – ر ) the Rule will be Idgham without Ghonnah.
كُفُوًا أَحَدٌ – Ithaar Halqe because Tanween is followed by Hamza – It means to pronoun Tanween Clearly in Tajweed six Ithaar Halqe Letters ( ء – ه -ع – ح -غ – خ ).
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Learn Surah Al Falq with Tajweed Rules