Partitions in Linux?

Question

linux

I put it on a laptop with Win10 Debian. After installation checked fdisk -l and got:

$ fdisk -l
Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0x790e5a1c

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *         2048    206847    204800   100M  7 HPFS/NTFS/exFAT
/dev/sda2          206848 368642047 368435200 175.7G  7 HPFS/NTFS/exFAT
/dev/sda3       368642048 886750228 518108181 247.1G  7 HPFS/NTFS/exFAT
/dev/sda4       886751230 976771071  90019842  42.9G  5 Extended
/dev/sda5       886751232 968574975  81823744    39G 83 Linux
/dev/sda6       968577024 976771071   8194048   3.9G 82 Linux swap / Solaris

Partition 4 does not start on physical sector boundary.

What does the message about section 4 mean and what to do with it?

Answer 1

Extended section. Merges other logical partitions.

Answer 2

Yes damn laziness to google chtol Wikipedia: Types of disk partitions