How to use EL Expressions in Oracle Cloud

How to use EL Expressions in Oracle Cloud.
Oracle Fusion EL Expressions

[@madwait1971]

Very well explained

[@ralucab1185]

thank you!! do you know how to make a field Read-only based/if another field is Read-only or not?

[@jfpar99]

Thanks Sir.
A doubt, so that an icon in the "Me" or in "My Team" part can only be seen by users who have the role "XXXA", how could you configure this requirement? Thanks