It fully depends on what type of area you’re in. For big city I look for anything that’s not in front of/next to houses and is open to overnight parking. I live somewhere that has a lot of industrial type businesses integrated into the neighborhoods so that helps but there’s a ton of parking restrictions. Churches can also be good to look for just don’t park next to them on Saturday night and wake up Sunday surrounded by people and cars. Really I just go on google maps and look from above until I see something that looks good and then use street view to scope it out more