The first is that 'realizing', 'realize', 'realization',
'realising', 'realise', and 'realisation' are always spelled with an
'a'. You know that you can remember this because one of the
definitions of the verb 'to realize/realise' is 'to make real'.
The second is that 'remember' is always spelled with two 'm's and
three 'e's; 'remembrance', on the other hand, is always spelled with
two 'm's, three 'e's, and an 'a'.
The third is that 'weird' is an exception to the 'i before e' rule,
which is fitting given its definition.
The fourth is that there is a significant difference in meaning
between the words 'accept' and 'except'- the verb 'to accept' means
'to take willingly', for one, while the preposition 'except' means
'but', as in 'all of the previously listed things but the following
thing(s)'.
The fifth is the occasion for using an apostrophy between the 't' and
the 's' in 'its'. Although possessive nouns use apostrophes to
distinguish the possessive from the plural (Algernon's piano instead
of two or more men named Algernon; the grocer's business instead of
two or more grocers), possessive pronouns (my/mine, thy/thine, his,
hers, its, ours, yours, theirs) never do. While you understand this
concept, you decide to avoid using contractions that easily result in
misspellings. From now on, you will write 'it is', 'there is', 'you
are', and so on.
...by realizing five things.