Please read the cliff notes and other items in the wiki. The wiki is in the blue bar at the top of the page.
Read How to Secure Your Network (Don't Get Hacked!) in the wiki also.
1) Use Dahua starlight cameras or Hikvision darkfighter cameras or ICPT Night eye cameras (https://store.ipcamtalk.com/) if you need good low light cameras.
2) use a VPN to access home network (openVPN)
3) Do not use wifi cameras.
4) Do not use cloud storage
5) Do Not use uPNP, P2P, QR, do not open ports,
6) More megapixel is not necessarily better.
7) Avoid chinese hacked cameras (most ebay, amazon, aliexpress cameras(not all, but most))
8) Do not use reolink, ring, nest cameras (they are junk)
9) If possible use a turret camera , bullet collect spiders, dome collect dirt and reflect light (IR)
10) Use only solid copper, AWG 23 or 24 ethernet wire. , no CCA (Copper Clad Aluminum)
Read,study,plan before spending money ..... plan plan plan