1. Introduction to the econometrics of the "Variable X-growth" nexus2. Stationarity and an alphabetical directory of unit roots often used in the energy-growth nexus3. An A-Z guide for complete research when using the Autoregressive Distributed Lag (ARDL) bounds test approach in the broader energy-growth nexus4. A note on the VECM approach in applications of the energy growth nexus5. Adjustment speeds, elasticities and semi-elasticities; their importance in the energy-growth nexus6. Quantiles regression approach: A new approach in the energy-growth nexus with substantial benefits in asymmetry accounting7. Time varying fourier analysis in the energy-growth nexus or the x-variable-growth nexus8. Ways of treatment of cross-sectional dependence in the energy-growth-nexus and the X-variable Growth nexus9. The low profile of simultaneous equations modeling in the energy-growth nexus10. The Johansen cointegration method and several others during the evolution of the energy-growth nexus and the broader "X-variable"-growth nexus11. How does the wavelet approach satisfy the required deliverables in the energy-growth nexus studies?12. Variance decomposition approaches and impulse response functions in the energy-growth nexus 13. A note on non-parametric and semi-parametric strategies in the energy-growth nexus14. Making the energy-growth nexus useful through a meta-analysis15. An a-z guide for the energy-growth nexus studies16. A conclusion to the guide in energy-growth nexus