As a relatively new brewer with some successes and failures (as expected) but I've never done sparging before. Can someone explain to me what sparging is, and if it's necessary to create a beer?

Hey, friends and family alike have been giving me a wish list of beers they want me to brew, and a chocolate stout is one of them. I'm aiming to please right now, so any feedback or suggestions would be nice, thanks fellas. https://www.brewersfriend.com/homebrew/recipe/view/637277/spirit-of-ire

Hello, fellow home brewers. I have a question to ask. I have been writing and brewing my own beer recipes for a while and whilst brewing a Vanilla Russian stout, I asked myself: Can you assemble your own beer kits, ( DME or LME, grains, hops, and yeast included) and sell it online. Are there any...