First Timer very confused about baggage restrictions

GetHuman-tendingr's customer service issue with Ryanair from August 2018

Help with my Ryanair issue
Tip from another customer
If you've travelled on multiple airlines, the airline that takes you to your destination is always responsible for retrieving your bag, even if you departed on a different airline.
The issue in GetHuman-tendingr's own words
Figure out what baggage to take that won't be charged. ... this is my first experience with Ryanair, so I am unfamiliar with the baggage policy, and quite confused. *. If my bag is deemed too large, what will I be charged? Res.***QRMA**To Athens FR****, FRA - Athens, Tue, ** Sep **. **.If it is the correct size, Is it free to check in the **Kg one and bring the small one onboard?**.Now that the reservation is made, what would I be charged to bring both onboard?*and *. how do you measure a soft, squishy bag?
The description of baggage limits is too vague.
tell me**. How squishy bags are measured?**. Are all checked bags charged or just oversize, overweight bags?**. If I only have one bag of correct weight can it be an inch oversize?**. If both my bags are undersize and underweight but I am not a Priority customer, how will my carry ons be treated?**. If my backpack fits under the seat but is slightly oversized will there be a fee?
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Ryanair

Customer service issue
Reported by GetHuman-tendingr
Aug 28th, 2018 - 4 mons ago
I have an issue with Ryanair too
Fixed
Seen by 17 customers so far
Similar issue to 2862 others
0 customers following this
Items needed
Name on booking
6 Character booking reference
Email address used for booking
Timeline
GetHuman-tendingr started working on this issue
Aug 28th 1:23am
GetHuman-tendingr indicated the issue is not fixed yet.
Aug 31st 3:30am
GetHuman-tendingr indicated the issue is not fixed yet.
Aug 31st 3:31am
GetHuman-tendingr indicated the issue is not fixed yet.
Aug 31st 3:37am