Hello you would not be assured a total all profit investment not even the best professionals or experts can boost of complete profits when ever they make an investment you can cut down or minimize on any loss you might encounter.
1.Know what you are trading in: is what you are trading in profitable is it what people wants, is there any future possibilities that can come form it
2. Keep your capital in the range of what you can afford to lose: let your start capital fund be according to your account size can carry. don't do too much as a starter, investment is steady and not to be zoomed in