How to dereference a reference to a hash or to an array in Perl
Moo with hash reference as attributes - with or without default values
ref - What kind of reference is this variable?
Search for hash in an array of hashes
Merge hashes of arrays
A hash and its uses - video
Creating a hash - video
Creating a hash from an array - video
Dumping a hash - video
Fetching data from a hash - video
exists, delete in hash - video
hash in SCALAR context - video
undef on Perl arrays and hashes
Key/Value Hash Slices
How to sort a hash in Perl?
How to sort a hash of hashes by value?
Reading CSV file as many hash-es
Creating a hash from an array in Perl
Hashes in Perl
How to insert a hash in another hash in Perl