Your First Recording and a Map of Your Comfortable Range
The first step in learning to sing happens before any song: finding the range where your voice comes out without strain. The method is simple. Hum a note that feels relaxed, slide slowly downwards until the sound starts to crackle or fade, then slide upwards until the neck begins to tighten. The two edges that still feel easy mark out your comfortable range, and that is where basic technique gets built during the first weeks.
Record this on your phone's built-in recorder, then play it back with a tuner app or digital piano nearby. Write down the names of the lowest and highest notes that sound clean. Putting them on paper matters because your own ears are unreliable while you sing. A note that feels right inside your head can sound off on a recording, partly because the bones of the skull carry sound straight to the singer's ear.
Untrained adults usually use around one to one and a half octaves, which is perfectly normal. What causes trouble is choosing a favourite song whose top note sits outside that range in week one. The throat squeezes to reach it and the session ends with a tired voice. Make a comparison recording every week using the same note and the same line of lyrics, so any change you hear really comes from practice.
The comfortable range captured in your first recording becomes the yardstick for every exercise that follows.