MIB SIB in 5G in General

System Information consist of MIB and number of SIB's.
System information can be devide into two group -

1. MSI (MIB+RMSI) : Minimum System Information
• Carries Basic information required for Initial Access
• Information for acquiring other SI
• MIB+RMSI
2. RMSI : Rmenaing Minimum System Information
• SIB1
3. OSI: Other System Information
• This consist of All other SIB's not broadcast-ed over Minimum SI.
• SIB2 to SIB9

• MIB :
• Contains cell barred status information and essential physical layer information of the cell required to receive further system information, e.g. CORESET#0 configuration. MIB is periodically broadcast on BCH.
• SIB1:  
• Defines the scheduling of other system information blocks and contains information required for initial access. SIB1 is also referred to as Remaining Minimum SI (RMSI) and is periodically broadcast on DL-SCH or sent in a dedicated manner on DL-SCH to UEs in RRC_CONNECTED.
• SIB2:
• contains cell re-selection information, mainly related to the serving cell;
• SIB3: 
• contains information about the serving frequency and intra-frequency neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as well as cell specific reselection parameters);
• SIB4: 
• contains information about other NR frequencies and inter-frequency neighbouring cells relevant for cell re-selection (including cell re-selection parameters common for a frequency as well as cell specific reselection parameters);
• SIB5:
• contains information about E-UTRA frequencies and E-UTRA neighbouring cells relevant for cell reselection (including cell re-selection parameters common for a frequency as well as cell specific re-selection parameters);
• SIB6:
•  contains an ETWS primary notification;
• SIB7:
•  contains an ETWS secondary notification;
• SIB8:
•  contains a CMAS warning notification;
• SIB9:
•  contains information related to GPS time and Coordinated Universal Time (UTC).

Source: https://www.techplayon.com/5g-nr-system-information/