Learn the opposite things at once and place their definitions/descriptions close to each other. Take a look back to be sure you know how to reverse the actions or to notice if it’s impossible.

Exempli Gratia:

• Languages: anthonyms (good/bad; big/small; lay down/pick up);
• Math: operators and functions (add/substract; power/root);
• IT/OS: commands to create/delete (files,users…); start/stop (processes, services…); install/remove apps etc.;
• IT/Programming: create/erase (data instances…); fill/clean up (vector, array); construct/destruct (objects …); show/hide (GUI nodes…)

Some of the entities may not have reasonable binary differentiation, the scope of the basic meanings you better consider in this case:

• Nominativ / Genitiv / Dativ / Akkusativ
• settlement / village / town / city / megapolice
• sin / cos / tg / ctg and their reverse a-functions
• copy / move / rename /edit