These are general tips , but there are much details for each tip to be implemented :
1- Focus.. select max 3 currency pairs that you will trade. Know all about them: technical & fundamental
2- Make your own strategy. . Don't copy someone unless you are convinced about his trades.
3- Tend is your friend. . So allways look at the big picture to define your long term direction.
4- Be good at discovering support & resistance levels on all timeframes : monthly, weekly , daily , hourly. This is your guide for defining entry & exit points.
5- Learn from others.. a good way to do this is by joining forex contests and watching what other people do.
6- Plan your trades.. study first, define potential trades , place market orders that match your plans otherwise only place pending orders.
7 - Preferably, Don't trade during news. If necessary , keep tight stop loss to avoid high losses.