Can I make a back up for it? So if it gets bricked I can undo the changes?
What are the causes of getting bricked? What should I do to prevent it? I really have no Idea how it works
Here's what ive done, I installed homebrew Channel. So if i installed Bootmii as an Ios then installed preloader I am good to go? Backups work already?
Messing with your IOS such as installing bad wads or deleting some that you should not . Also installing a system menu that is not your system menu version such as installing a theme menu thats made for 4.1u but you install it on a 4.3u menu.
You need to actually get some homebrew. The Homebrew Channel just launches other homebrew. You need to put things on your SD card/USB hard drive in the /apps/ folder. A good starting place is probably the Homebrew Browser, a homebrew which catalogues other homebrew for you to download.