Ps4 & Ps5 Game Installation Guides?

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Ive had a jailbroken ps4 for a few years now and with the recent releases my ps5 is officially jailbroken as well! I have a few questions.

1. Where can I refer to for the most up to date way to install games for the ps5? Modded Warfare has one that was uploaded over 2 years ago so im sure thats outdated. Other videos I have seen show different methods and are a bit confusing.

2. Is installing ps4 fake packages the same process as installing ps5 games or a different method all together?

3. Any particular reason why people aren't installing ps5 games directly to the ps5s internal storage?

4. Can the ps5 play all the ps4 fake packages? Any particular reason to keep my jailbroken ps4?