Examine oneself before examining others.
We are quick to comment on others or criticise actions by people without being aware of the full picture. We speak or write about our feelings and emotions, which have already existed in our minds for a long time. We go backward and correlate events with our persistent frame of mind. This is a pattern that widens the gaps in our understanding and is a barrier to the growth and forwardness of the human race.
Even in hard times, we have to look forward and work on the premise that the sun shines, rain falls, wind blows, and birds fly without discrimination.
We have to learn how to look inward. It is self-reflection. It is self-questioning. When we stand before a mirror, what do we see? Own face. 
A mirror reflects the light to see what we are. Just stand and monitor our own feelings, emotions, joy, sorrow, fears, and hope in a mirror inside. We get pictures of what is going on inside, whether systematic or haphazard, possible or impossible.
When our own feelings are impure, expecting external affairs to be pure is a great mismatch. If we pay attention to discrepancies, it becomes necessary to amend ourselves before asking others to make corrections.
Put simply, reflection is a way to analyse the pictures before making an opinion. It enhances our awareness. It pinpoints our mistakes. When we are lagging behind in our mission, it reflects on our inadequacies to handle the affairs effectively. 
Self-reflection solves many issues because we have put ourselves to the test. It comes with practise. It comes with blaming ourselves before raising fingers at others. It is the right way to resolve conflicts in homes, workplaces, organisations, or somewhere else.
Now a step further changes the whole spectrum of our lives, and that is introspection. Introspection is deeper than what we gather in reflection. Introspection questions our behaviours, approaches, concepts, and even sets of beliefs. Introspection is a deliberate process of reflection.
We discuss our job’s merits and demerits with friends. It is a reflection. In a moment of calmness, we ask ourselves if we can do a better job by looking at the opportunities expanding all around us. It is introspection.
Introspection tries to profile the issues and explore how to rectify the flaws. The more we get to know ourselves, the more we hesitate to ask others to be flawless.
We can reflect on what is happening around us when we do all the exercises before coming to our concluding remarks. In this age of multiple sources of information and instant accessibility, verification of facts is in our hands. But we need clear intentions and open minds, nothing more.
People desirous of introspection may do so if they aim high, are inclined to know how to connect people with diverse arrangements of the universe, and abide by the laws of surviving and thriving.
Even on a small scale, we can do wonders if we take the route of reflection. It is like gathering ingredients before cooking. When we arrive at judgements without details, we create nonsense that makes even stable things unstable.