About Hindi (Devanagari) letters
Devanagari writes consonants with an inherent a; vowel signs (matras) attach to the consonant and the virama removes the vowel to form clusters.
Most people type Hindi with a transliteration input (Google Input Tools, Windows Hindi Phonetic, macOS Hindi - Transliteration) where namaste becomes नमस्ते. The traditional Inscript layout is also built into Windows and macOS.
The danda । ends a sentence in place of a full stop.
Hindi (Devanagari) letters: names and codes
Every letter with its name and Unicode code point. None of these have classic Alt codes; in Word type the hex code and press Alt+X, or use the HTML code on web pages. Click a letter to copy it.