Please help me recommend which SLR camera is suitable for beginners.

Oh my god, you can change the lens on a DSLR, whether it is a kit or not. As long as the mount is aligned, it doesn't matter what lens you buy. Newbies are advised to use kits, which means a set of lenses and body produced by the original manufacturer.

Once you become proficient, you can use other good lenses

Canon EOS 77D kit (18-135mm IS USM) full pixel dual-core focus, 18-135mm focal length

Nikon D7200 kit Machine (18-105mm) Release date: March 2015 Product type: Mid-range SLR Sensor type: CMOS Sensor size: APS frame (23.5*15.6mm) Effective pixels: 24.16 million Optical zoom: 0x Battery type: Lithium battery ( EN-EL15)