LAMP (Linux, Apache, SQL, PHP)
LAPP (Linux, Apache, PostgreSQL, Python) vs. LAMP (Linux, Apache, SQL, PHP)
"yum" is a package manager that is commonly used on Linux distributions such as Red
Hat and CentOS, however, it is not available on all Linux distributions. Instead, Ubuntu
and its derivatives use the "apt" package manager.

"httpd" is the package name for Apache HTTP Server on RedHat, CentOS and Fedora
distributions. But Ubuntu and Debian-based distributions use "apache2" as package
name.
Load-balancing
Caching
Database schema design
Slave-master replications 5.
Database sharding
NoSQL
API design
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