We all have trouble with those. I know I do. htm
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We all have trouble with those. I know I do. There is a good article here: https://www.englishclub.com/spelling/rules-ible-able.htm
English has many words that are formed with prefixes, root words and suffixes.
It is sometimes helpful to learn word patterns. A dictionary with suffix and prefix entries can useful in understanding the etymology, or word history. There is an English etymology dictionary:
Name10 like -able, -ible
When I have this kind of problem, I write the words down in columns as I learn them.
.................. ABLE ...................... IBLE ..................
............. --- able .............. - - - ible ..........
............. --- able .............. - - - ible ..........
............. --- able ..............