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ECR of capacitor for ADP124

I have one through datasheet of ADP124 and it is mentions that "A minimum of 0.70 μF capacitance with an ESR of 1 Ω or less is recommended to ensure the stability" and i need some addition details for power supply application

1) at what frequency we need to check ESR( part like C1005X5R1A475K050BC have plot of ESR vs Frequency)

2) in  general is it different consideration  for ESR for LDO application and for Buck converter application in terms of frequency at which we are looking for ECR(does buck converter switching frequency should be consider).

3)How low ESR is helping to improve design

4) is it possible to reduce ESR by combination of capacitors

5) do we need to consider ESL of capacitor