Please don't teach ur child to By heart spellings its a bad practice. In schools teacher tell students to write one 5 times or ten times like that but this is not the proper way to teach spellings.
First Important thing is to teach to build the spellings by using phonics.
Concept of Phonics should be clear.
Then teach the sight words the words that are some of the most frequently used words in the English language. The following are pre-primary sight words there are more for 1st graders and 2nd graders.
a and away
big blue can
come down find
for funny go
help I in
is it jump
little look make
me my not
one play red
run said see
the three to
two up we
Then teach the three letter Rhyming words
for eg : Cat , Bat , Sat, Rat, Pat , Mat etc
then four letter rhyming words and more
Then teach Use of Vowels and Consonants
Then play wordsearch game with them.
I play Scrabble with my (1st grader) son.
Then you can play Crossword with them.
I play Hangman game with my son.