ADB detects but, fastboot does not detect device in windows 10
For most Android devices, there is a fastboot menu with and image of an open Android and some options. Accessing it usually involves turning on the phone while pressing one or both of the volume buttons. However, Samsung devices have it differently.

Instead of using fastboot, you use Odin. (These instructions are for a galaxy tab 3, might vary by device.) If you turn on the phone while pressing home and vol down, you enter download, or if you used Odin before, Odin mode. This is used instead of fastboot to flash Roms.

There are many videos on how to use Odin to flash Roms like CWM and TWRP, so search for one of those.