A new article by Tom Corson-Knowles about spelling includes advice by Janet Ruth Heller.
For example,
“People spell better when they learn word roots and the prefixes and suffixes that we can add to words to create related words. Linguists call such components of words with meaning morphemes. For example, the word invigorate has three morphemes: the root vigor, the prefix in-, and the suffix -ate.
We can learn a lot of these by studying word lists, but Janet notes that “Taking foreign languages like Spanish, French, Latin, German, etc. can also help people to understand word roots.”
You can read the whole article entitled “Why Spelling Still Matters and Smart Strategies to Spell like a Champion” at https://www.tckpublishing.com/why-spelling-still-matters-and-how-to-spell-better/
