( https://www.samuraj-cz.com/clanek/cisco-ios-1-uvod-prikaz-show/ ):

( print every show commands )

sh ?

( show running config )

sh run

( show interface description )

show int des

( show ip interfaces brief )

sh ip int br

( show logging )

sh log

To changing coniguration:

conf t

( configure terminal, to return Ctr + z ) Example change some interface:

int Gi2/0/14

( some interface from show int des ) Before change print configuration interface :

Mainswitch#sh run int Gi2/0/14
Building configuration...
 
Current configuration : 318 bytes
!
interface GigabitEthernet2/0/14
 description BC10 Huawei MM2
 switchport access vlan 247
 switchport mode access
 no logging event link-status
 no snmp trap link-status
 storm-control broadcast level pps 200 150
 storm-control multicast level pps 100 80
 spanning-tree portfast
 spanning-tree bpduguard disable
end

After that for example change VLAN :

conf t

( enter configuration mode )

int Gi2/0/14

( enter configuratio interface )

switchport access vlan 240

( change VLAN access ) To change VLAN access to trunk

no  switchport access vlan 247

( delete access mode conf )

no  switchport mode access

( delete access mode conf )

switchport mode trunk

Save configuration :

write

( save configuration )