Security cameras

Anyone know or have any good security camera systems for outside the home that is on the more financially friendly side? I have some on the inside but it’s been brought to my attention that a car sits outside my home in the middle of the night. I work nights. Also am a 21 year old female who lives alone. Preferably something that doesn’t run on WiFi that would be easily “hackable”. Wanting some good proof before the cops are involved. I witnessed it tonight, but don’t wanna call the cops unless it is something threatening.