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Emulated filesystem is an abstraction layer on actual filesystem (ext4 or f2fs) that serves basically two purposes: Retain USB connectivity of Android devices to PCs (implemented through MTP now a days)
/storage/emulated/0 is the "internal SDCard", which should be what's displayed when connecting the device to your computer. I don't own a Nexus, but on most devices that place is available also as either /sdcard or /mnt/sdcard .
/storage/emulated/0/: to my knowledge, this refers to the "emulated MMC" ("owner part"). Usually this is the internal one. The "0" stands for the user here, "0" is the first user aka device-owner. If you create additional users, this number will increment for each.
/storage/emulated/legacy -> /mnt/shell/emulated/0 (the first user – in my case the only one). Second, where you usually look for it: /sdcard -> /storage/emulated/legacy Same game again. So for the emulated SD card (aka the "internal SD card), the Android system takes care to map it accordingly for the current user.
Btw, my /sdcard/ always points to the first user's space /storage/emulated/0 at adb shell regardless what my current user is at mobile UI. For all native processes running in root mount namespace (including adbd), /sdcard is a symlink to /storage/emulated/0 and /storage/emulated is bind mounted from /mnt/runtime/default.
From there two links exist. One to /storage/emulated/legacy and one to /storage/emulated/0. The emulated in the filename also suggests that both location are just, well, emulated. This can vary from device to device, for example on an HTC I have here /stoage/sdcard0 is just a link to /storage/emulated/0 instead of the actual mountpoint.
"In the case of devices without true external storage, it's still necessary for Android to provide an emulated external storage in order to remain compatible with older apps. In other words the RAM is physically internal (non-removable) but a section of it is partitioned and the Android file-system APIs treat that partition as being "external ...
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Alternatively you can install Total Commander, Root or File Explorer (or similar app) in BlueStacks, then transfer your files into fake SSD card and they should appear in C:\ProgramData\BlueStacks\UserData\SharedFolder folder.
/storage/emulated/0 is traversable, readable or writeable to apps depending on the status of manifest permissions READ/WRITE_EXTERNAL_STORAGE. These measurements are a part of Android's app sandboxing approach for better isolation, security and privacy.