Defining "right", "left", "far-left", "far-right" is quite simple on an overview level.

"far-left" and "far-right" are trying to destroy our society and want to install communism or fascism, reject democracy where people can vote.
"right", "left" are normal political views, where society is done and democracy is held up, where people can vote.
"right" is more conservative values, like "we want to go back how we lived 20 years ago". .
"left" is more liberal values, like progress and more modern.

"Far right" likes killing Jews.
"Far left" like surveillance state.

Next, it is also important to know, "far-left" and "far-right" have also common ground. Both are waiting to destroy our society and it might be possible for a "far-left" dictator to join a "far-right" dictator to join forces to destroy a normal country, where no dictator is ruling just for both dictators to turn against after the normal country is destroyed.
When "far-left" and "far-right" join forces, it is called "horseshoe theory".

Not all points might apply every time.

An example:
Trump is far right because he attempted a coup on January 6 but luckily it failed.
Trump's hardcore supporters are a large part fan of fascism.
Trump is a good example of horseshoe theory because Trump likes Putin, who's a Russian communist, surveillance state fan and "far-left" dictator.