Ride on the big ring in the front and shift to larger cogs in the rear as the pedalling gets harder (headwind or slight uphill).
Shift to smaller cogs in the rear as the pedalling gets easier.
Keep your cadence at about 75-90 RPMs.
Shift to the smaller ring on the front when climbing hills and shift to the cog (in the rear) that allows you to pedal at a steady cadence (RPM) of about 70-85.
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The Lord is merciful and gracious, slow to anger and abounding in steadfast love. - Psalm 103:8
I am a cyclist. I am not the fastest or the fittest. But I will get to where I'm going with a smile on my face.