You don't have to be dyslexic to have trouble with English spelling - there are so many traps and pitfalls, and exceptions to all the rules. I am pretty good at spelling, but I have my own little ways of remembering the tricky ones, and I have to say I am finding I have to work harder at it now, as I get t older. Things that were once intuitive to me I now find I have to stop and think about.
Sometimes thinking will sort it out: "summery" contains "summer", whereas "summary" does not.
Some groups of related words have the emphasis on a different syllable, helping you to work out the spelling: "invite" tells you that "invitation" has an "i" as its second vowel, while "catastrophic" and "catastrophe" each tell you about how to spell the other.
I always remember that "stationARy" is like a cAR, while a stationer sells stationery.