Light alcohol and impact on fitness, and other lifestyle things (discussion).

I did a "dry January" for financial reasons and at the same time (ETA: mildly) increased my calorie and protein intake. Hard to tell what is what, but I've made a lot better progress in my lifts over the last month.

I was having 1 tallboy beer per week, which doesn't seem like it would have major effect. Does anyone know if there's any research on light/mild alcohol intake on fitness (particularly muscle or strength gain)?

I'm also curious, outside of the gym, what have been the most useful lifestyle changes for you to support your fitness goals?