Is there an easier way of learning noun/adjective/verb endings?

Unfortunately, this tends to require rote learning. However, many of the example words used have a certain rhythm to them which makes this easier, such as the Latin 2^nd person neuter, bellum.

Beyond just reciting, you can consolidate and check what you’ve learnt by filling in as much of a blank table as you can (which will also highlight any particular groups that you may struggle with). Or you can take an unseen passage of text and try translating it, but analysing the endings of all the verbs, or whichever grammatical part you are looking at, which is called parsing.