1) Volume
2) RSI
3) Stochastic RSI
4) Moving Averages
5) Volatility-calibrated ATR
There's a couple I agree with and a few I disagree with.
Volume analysis is crucial. Most indicators are just derivatives of price; volume is one of the few that isn't. Volume extremes generally indicate inflection points. Strong vs. weak volume can distinguish between the primary trend and counter trend.
A momentum indicator like RSI is recommended but I much prefer Chande Momentum to RSI. I also recommend against using stochastic indicators. Crosses are unreliable and overbought/oversold levels aren't very useful.
Moving averages are always good to keep an eye on. The 20-period, 50-period, and 200-period are my short, mid, and long term gauges for trends. Golden crosses and death crosses can help confirm the primary trend.
For volatility/deviation measure, I prefer Bollinger Bands and BB width. It's a million times more intuitive to read than ATR.