Am I reading it wrong?
Which one am I supposed to follow when putting a transactions?
The fee rate recommendation is below text "Transaction Fees". As for which recommendation, you can hover your cursor (on desktop) or touch (on mobile) the priority text to see their defnition of high, medium, low and no priority.
Which one am I supposed to follow when putting a transactions?
This depends on the seize of your transactions, but for simple transaction just follow recommended transaction fees.
As stated by @LoyceV, it should be depends on OP needs since mempool.space shows
fee rate recommendation.
Currently this is 2 sat/vB but even 1 sat/vB should probably be confirmed quickly.
For more complex transactions including multiple inputs and outputs that could be different.
Here is one website that can calculate fees for specific number of inputs/outputs:
https://coinb.in/#feesSome wallet also have preview feature where you can see transaction size before the TX is signed/broadcasted.