I'am now at Part 4 from Ana Pana and I don't understand how "ajx" and "ad" works. Do you have some examples?

xpos:I'am now at Part 4 from Ana Pana and I don't understand how "ajx" and "ad" works. Do you have some examples?

"ad" shows a continuous action.

La flegistino paroladis. = The nurse talked continuously.
Mia frato manĝadas = My brother keeps eating.
La virino kantadis senĉese dum tuta horo! = The woman sang continually non-stop for a whole hour!

La daŭra martelado lacigis min. = The continual hammering wearied me.

In this case, "martelo" is a hammer, and "martelado" is the act of hammering.

"aĵ" shows "something concrete, specific" but to me seems a little abstract...

Esperantaĵo = something in or related to Esperanto
Volapukaĵo = something in Volapuk, or, more often, any kind of gibberish
Fiŝaĵo = fish meat
Porkaĵo = pig meat, pork
Frenezaĵo = some manifestation of insanity

And so forth.

Thanks. It's very hard for me but I think that I will understand it better when I practice more.