02-12-2018
Welcome to the forum.
Please tell us which question you want answered: the one in the title, or the one in the text? It would help if title and text were consistent...
There are many techniques out there pretending to help / teach you how to memorize even the most abstract things. From my perspective, experience is best, i.e. using / applying relevant commands again and again, best in different contexts, until you master a broad set of different helpers for different problems.
For the importance of commands, I can't help you, as this is dependent on the environment and the type of task(s), and it can change on a daily basis. Its best not to memoriize just the "important" subset commands but to master a broad set of different tools.
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spell(1) General Commands Manual spell(1)
NAME
spell, spellin, spellout - Finds spelling errors
SYNOPSIS
spell [-b] [-i | -l] [-v | -x] [-d hash_list] [-s hash_stop] [-h history_list] [+word_list] [file...]
spellin [list] [number]
spellout [-d] list
The spell command reads words in file and compares them to those in a spelling list. Default files contain English words only, but you can
supply your own list of words in other languages.
STANDARDS
Interfaces documented on this reference page conform to industry standards as follows:
spell: XCU5.0
Refer to the standards(5) reference page for more information about industry standards and associated tags.
OPTIONS
[Tru64 UNIX] The following options are for the spell command only. Checks for correct British spelling. Besides preferring centre,
colour, programme, speciality, travelled, and so on, this option causes spell to insist upon the use of the infix -ise in words like stan-
dardise. [Tru64 UNIX] Specifies hash_list as the alternate spelling list. The default is /usr/lbin/spell/hlist[ab]. [Tru64 UNIX] Speci-
fies history_list as the alternate history list that is used to accumulate all output. The default is /usr/lbin/spell/spellhist. [Tru64
UNIX] Suppresses processing of included files through the and troff macros. If the -i and -l options are both specified, the last one of
the two options entered on the command line takes effect. [Tru64 UNIX] Follows the chain of all included files (.so and
spell(1)