There are a lot of closures and instructions, and a list of some of your favorite memos.
Emerge Sync Sync Portage
Emerge-ud World upgrades the entire system
Emerge <PackageName> installation Packages
Emerge <PackageName> f Download the files required for the specified package installation
Emerge <PackageName>-PV View the dependencies and use flags for installing the specified packages
Emerge-c <PackageName> Uninstall Packages
EUSE-E <use-flags> settings allow use flag (modify use in/etc/make.conf)
euse-d <use-flags> settings prohibit use flag (modify use in/etc/make.conf)
Euse-i <use-flag> Query Use flag description
Eix <RegExp> Search Packages
Eix-i list installed packages in the system
Equery files <PackageName> List installed packages
Equery belongs <FileName> query which package is owned by the specified file that is installed
Ebuild <xxx.ebuild> Digest Generate summary files
Ebuild </var/db/pkg/xxx/xxx.ebuild> Config Initialization configuration
Note: To use Euse, equery need to install the Gentoolkit package, Eix need to install Eix package.