So I found out that the Apollo 11's guidance computer had 2k memory but like of what? 2,000 Terabytes? Basically I would like to know the units

1 K = 1024 bytes; 1 TB ≈ 10^12 bytes

A byte is a unit of computer storage that can hold a single character (e. g. the letter "a" or the nymber "2").

The symbol K stands for kilobytes.

A kilobyte (K or KB) is 2^10 bytes = 1024 bytes ≈ 1000 bytes.

Thus, the Apollo computer had 2048 bytes (about 2000 bytes) of memory.

A terabyte (TB) is 2^40 bytes = 1.099 511 627 776 * 10^12 bytes ≈ 10^12 bytes