Haha actually i more interested to learn scalping.. but few rules to minimize losses
1. Stock I already own, must be very stable, and want to keep long term (divvy stock). Trade ~20% of the stock I have
2. If stock up, sell and wait for pull down, buy back = short sell, earn spread
3. If stock down, buy and wait to go up, sell = earn spread
4. If get stuck, ie buy but stock down, = no problem as I collecting on long term, collect divvy, wait for up later
5. If get stuck, ie sell but stock up, = no problem as holding all goes up, buy back lower later
Buy sell within 0.5%-1.0% spread.. but over and over .. can do? Need to have relatively big holding and capital..

But needs lot of time in hand.. so planning do that IF I have free time.. never tested on 555 book, but I see the daily movement looks like can do...
Warning : The above is my self thought theory, never tested before.. so don't try

I shall let Ah Max answer you cos I am terrible and I suck at scalping.
*ps. if not careful... you might end up with a lot of stocks.
* I suggest many months of practice first.....