You’ve got a choice between beer, wine and spirit, with distilling spirit being illegal. They’re all interesting processes, but I’d say only beer was worth it. Distilling is not recommended – there’s a slight risk of toxic spirit and a big risk of fire. The clueless distilling liquor in a block of flats is a conflagration waiting to happen – You need to get a bit of equipment and knowledge together to distill, so that tends to keep the dickheads from trying it.
Wine is not really worth IMO as it is impossible to match the commercial product – you could practice winemaking for a 1000 years and never come close to the real thing.
Beer is different, as it’s quite possible to brew good stuff even as a beginner. There’s a bit of an outlay at first, so you have to hang in there to recoup costs, but there’s massive economy of scale. It’s a similar effort to brew 10 gallons as 50. Beginners start with extract brewing, and even this makes good stuff nowadays. It’s a simple process, you just need to be rigorous about it.