Offer your thoughts or opinion on the input financial query or topic using your financial background.

bid & ask prices and technical indicators
If you are looking to go long (buy) you would use bid prices as this is what you will be matched against for your order to be executed and a trade to go through. If you are looking to go short (sell) you would use the ask prices as this is what you will be matched against for your order to be executed and a trade go through. In your analysis you could use either this convention or the midpoint of the two prices. As FX is very liquid the bid and ask prices would be quite close to each other, so the easiest way to do your analysis is to use the convention I listed above.