I trade the Betfair Exchange, using Bet Angel software, & I focus on In-Running Horse Races.
Even though I've been consistently profitable for some time now, I class myself as an amateur trader as it's not my main income. My goal here is just to help exchange trading beginners.
I've done a Beginners Guide to In-play horseracing here: runlikeadrain.com/betfair-trading/
The majority of my trades are L2B, though occasionally I do B2L.
I started off doing Matched Betting many years ago but when I found trading, I've loved it ever since. I started with pre-race trading but I could never make a go of it.
I instantly preferred in running (In Play Trading) as soon as I tried it. My instant love for in-play trading sadly didn't mean I was instantly good at it. It took me a long time and a lot of hard work to be able to win consistently at it.
Over the years I've been able to improve my race reading skills and more importantly, learn the discipline required to be profitable.