Some letters in traditional Mongolian may have multiple codepoints and mappings, this is reserved for different pronunciations of the identical-looking letters.
Certain grammatical suffixes are preceded by a narrow non-breaking space (NNBSP), NOT a normal space, these suffixes are always written without any space in Cyrillic Mongolian.
The disjoint tail (which is quite common), namely ᠠ, should always be preceded by an MVS (U+180E), NOT an NNBSP or a normal space.
When typing the vowel ü/ү ᠦ (U+1826) in foreign words (usually get a в in Cyrillic), add an extra FVS1 (U+180B) after the letter.
When typing the consonant t/т ᠲ (U+1832) in foreign words, add an extra FVS1 after the letter, unless it sits at the beginning of the word.
When typing the consonant d/д ᠳ (U+1833) in foreign words, add an extra FVS1 after the letter, unless it sits in the middle of the word, and also before a vowel.
When typing a single long tooth in a falling diphthong, use a single y, not i. E.g.: ᠨᠠᠶᠮᠠ nayma.