"Algorithmic trading" in the sense described in this article only makes sense if you have a customer who wants you to execute large trades and pay you a commission.
You can try some trading using algorithms to identify profitable trading opportunities. That would normally fall under "prop trading" instead. There are definitely people doing this in ways achievable by a home hobbyist, but don't expect any low hanging fruit. Find some niche in some less liquid instruments. Don't look for anything that relies on being fast - someone else will be there who measures latency in nanoseconds.
You can try some trading using algorithms to identify profitable trading opportunities. That would normally fall under "prop trading" instead. There are definitely people doing this in ways achievable by a home hobbyist, but don't expect any low hanging fruit. Find some niche in some less liquid instruments. Don't look for anything that relies on being fast - someone else will be there who measures latency in nanoseconds.