For support in English, ask for help at Nintendo Homebrew on Discord.
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Q: I am on the latest system version. Is my device hackable?
A: Yes

Q: How do I update Luma3DS?
A: Copy the boot.firm and boot.3dsx files from the latest release of Luma3DS to the root of the SD card, replacing any existing files.

Q: I heard about this thing I have to pay for (Gateway, Sky3DS, etc). Is that something I need?
A: No. boot9strap is a superior method of loading hax that runs early in boot.

Q: How do I move saves from an existing Gateway setup to device installed games?
A: See this

Q: How risky is hacking my console?
A: Bricks are now basically impossible unless you ignore/circumvent all safety checks.

Q: Can I run awesome homebrew and emulators with this?
A: Yes! Custom Firmware not only enables the Homebrew Launcher, but it also will give you hacks on all versions, which means you keep it forever, even with updates.

Q: Can I use this to play games from other regions?
A: Luma3DS supports Region Free patches, which enables users to install games from any region without any extra modification or steps.

Q: Is it safe to update CFW SysNAND?
A: Yes. This is safe, stop asking about it.

Q: Where should I go for support?
A: For support (in English), ask for help at Nintendo Homebrew on Discord.

Q: Can I do this with a 4GB (or smaller) SD card?
A: Yes!

Q: Can I use a 128GB (or larger) SD card?
A: Yes, but some users have reported slowdowns when using such large sizes. Note that you cannot format the card with exFAT; you need to format it with FAT32.

Q: How do I move to a new SD card at the end of this?
A: Just copy all the files to the new SD card.

Q: Can I keep my NNID?
A: If you start with an NNID and follow every step, you will end up keeping your NNID at the end.

Q: What about System Transfers?
A: Once you have completed the guide, you can system transfer to and from an B9S 3DS or 2DS exactly like you would a regular stock console or EmuNAND (you will lose any non-legitimate games/themes/DLC in the transfer; saves will stay even for games that are lost).

Q: Can I do this without a computer (e.g. an Android phone)?
A: All you need is the ability to put files on an SD card!

Q: Help! Something bad happened and now I cannot boot…
A: Please look at the troubleshooting guide.