OK!
for example its /boot folder (for last khadas ubuntu)
root@Khadas:/boot# ls -l1 /boot
total 50556
-rw-r--r-- 1 root root 868 Dec 30 17:05 aml_autoscript
-rw-r--r-- 1 root root 796 Dec 30 17:05 aml_autoscript.txt
-rw-r--r-- 1 root root 800 Dec 30 17:05 aml_autoscript.zip
-rw-r--r-- 1 root root 8183 Dec 30 17:05 boot.ini
-rw-r--r-- 1 root root 8501 Dec 30 17:05 boot.scr
-rw-r--r-- 1 root root 156725 Dec 30 16:38 config-4.9.206
lrwxrwxrwx 1 root root 11 Jan 9 12:11 dtb -> dtb-4.9.206
drwxr-xr-x 2 root root 4096 Dec 30 17:06 dtb-4.9.206
-rw-r--r-- 1 root root 2733 Jan 9 12:14 env.txt
-rw-r--r-- 1 root root 8469135 Dec 30 17:08 initrd.img-4.9.206
-rw-rw-r-- 1 root root 1994 May 31 2018 remote.conf
-rw-r--r-- 1 root root 8501 Dec 30 17:05 s905_autoscript
-rw-r--r-- 1 root root 8429 Dec 30 17:05 s905_autoscript.cmd
-rw-r--r-- 1 root root 5612780 Dec 30 16:38 System.map-4.9.206
lrwxrwxrwx 1 root root 15 Jan 9 12:11 uInitrd -> uInitrd-4.9.206
-rw-r--r-- 1 root root 8469199 Dec 30 17:08 uInitrd-4.9.206
-rw-r--r-- 1 root root 28979712 Dec 30 16:38 vmlinuz-4.9.206
lrwxrwxrwx 1 root root 15 Jan 9 12:11 zImage -> vmlinuz-4.9.206
1 is - copy new kernel initrd and dtb files to /boot
cp vmlinuz-new uInitrd-new dtb-new /boot
# fix links
ln -sf vmlinuz-new zImage
ln -sf uInitrd-new uInitrd
ln -sf /boot/dtb-new dtb.img
2 is - copy all new kernel modules
cp -a /tmp/modules/new /lib/modules/
PS: u can use scp - for remote copy
PSS: anyway u must understand always what are u doing 
GOODluck