Forex Technical Analysis Basics
There are tons of different ways to use technical analysis for trading, but with all types, traders use historical information (trading patterns from the past) in order to identify potentially recognizable patterns that might be currently emerging.
From hereon, traders use the information gathered to better understand the market's current condition, as well as the best 'entry' and 'exit' points.
Whereas fundamental analysis purely focuses on analyzing news developments and economic data, and how it might have an impact on the financial markets, technical analysis follows price movement within the markets.
Price Action
The framework used for technical analysis is derived from 'Dow theory', which is the theory that 'price is an accurate indicator and reflection of all information deemed relevant'. Therefore, anything that has a drastic effect on supply & demand will likely appear on the charts.
Moreover, any information that is not related to price action is deemed as predominantly useless, since it is not possible to properly quantify this information, it is not reliable data, and it's not possible to use it.
Technical traders tend to favour 'trends' within markets, and markets can move in 'uptrends' - which are 'bullish' markets wherein the highs are higher, and the lows are lower (with big gaps between the two) and 'downtrends' - which refer to 'bearish' markets wherein the gap between the highs and lows is much smaller, and the highs and lows are much smaller in comparison to a bullish market.
There is also the 'horizontal trend' which is known as a 'ranging market'. This is an undesirable scenario for bull and bear traders alike, due to the fact that there is not any particular power shift towards either side, meaning that both sides are equal in terms of their power within the markets.

If there is a ranging market, it means that the power is not high enough on either side, and because of this, trends cannot form, since the market is moving quickly and in no particular direction.
It is estimated that markets are 'ranging' about 60% of the time, which means that forex traders have to be very focused during a trading session, in order to accurately identify trends, and then take advantage of them.
History
It is argued by the majority of technical analysts that investors/traders operate in patterns. Therefore, because there exists this idea of some perceived predictability with regards to their trading behaviour, it is therefore possible to identify potential patterns within the markets as a result.
Furthermore, by analysing information within previous historical events such as recessions, trade wars etc, traders can predict how the markets might move if a similar situation occurs in the future.
For instance, when another global recession occurs, traders could use the 2008 global recession as a point of reference, identifying any trading patterns that emerged at the time, and then comparing that with the current market data, to see if there is any correlation.
Forex Technical Analysis Signals
Simply put, signals alert traders when to perform certain actions. A 'buy' signal indicates that they should start buying a particular currency, and a 'sell' signal indicates that they should start selling a particular currency.
There are also 'false signals', which as the name suggests, refers to instances where anomalies occur, and the signal is actually incorrect and should not be acted upon. For instance, they could occur due to a lag in timing, data inaccuracies, and other types of anomalies.
Forex Technical Analysis Strategies
Technical analysis can be performed either manually by the trader, or it can be completed via automated technical analysis, wherein computer software analyses the history of price movements for currency pairs and currencies.
Probabilities
By identifying patterns and then establishing the probability of future movements, traders can essentially make 'educated guesses' as to how the market conditions will develop moving forward.
By calculating probability, traders are essentially figuring out the 'chance' of whether or not a pattern will continue, or if it is going to shift into something else. There are no certainties here, but it is a more informed strategy for trading, since it involves using data to make predictions, as opposed to simply taking risks without information to support said risks.
Combining Fundamental & Technical Analysis
Many traders these days tend to combine fundamental analysis and technical analysis, with the logic that if all the data collected through both methods is pointing to similar patterns in the markets, chances are, it's something worth taking a risk on and moving with.