(In the PDF, the scales talked about here are on pages 5 to the end. There are three traditional minor scales always taught – simple minor, harmonic minor and natural minor, also Aeolian. Melodic minor is not a minor scale – it is two minor scales, simple ascending and natural descending.)
There is an easy way to change major into minor. For simple minor, b3. For harmonic minor, b3 and b6. For natural minor, also Aeolian, b3, b6 and b7. Remember, all modes and all altered scales are formed or can be formed by changing the major scale. Aeolian is a mode. Simple and harmonic minor are altered scales. This takes care of forming these scales, but there are problems in some for fingering.
In general you just keep the same fingering as you change the scales. For instance, C major and all three C minor scales use the same fingering in both hands. But this is not always true, so I have shown when they change. Gb F# and related minors are the most confusing.