BSL personally is hard to learn as if you don't use it you lose it. Plus I started properly learning from a guy I supported but he made his own signs up so I later found out. Its handy on nights out lol telling people who are far away from you what's going on etc.

Start with the alphabet as that's the easiest personally. BSL vowels are on your left hand. There are loads of people on youtube who do BSL. It's a handy thing to have tbh.

I've been learning random songs lol to up my signing

Ps I started learning sign language when I was 16 as I started working with children and young people with disabilities and we used a slang version of BSL called Makaton