How do you put your baby down to sleep

My little one turned a month old yesterday. Ive been putting her to sleep by holding her and then putting her in her bassinet once she’s asleep in the beginning of the night. After her night feeding she’s usually put back in her bassinet when she’s drowsy. Sometimes she falls right to sleep and other times she’s up for an hour or more. For example after she ate at 4:30am she was up for hours. What’s everyone else doing? Putting them to bed drowsy or after they are already sleeping after you put them to sleep? Also, trying white noise for the first time tonight. Kind of annoying to me as she is sleeping in our room, but hoping it helps her sleep. Fingers crossed!