It used to be about better conditions for the working class. It was the party of working class interests. Communism was an ideological extreme, as Nazism was for the right-wing.
However nowadays "left wing" "leftism" has been co-opted and tarnished by the 1% to become a hysterical moralising quasi-sexual civic religion that is all about some kind of nebulous agitation and "freaking people out, maaaaan" for some unknown pointless goal.
I can't recognise it anymore, it's just some puppeteered political side.
It doesn't have your national or personal interests at heart just like the contemporary "right wing." Both really have been corrupted, co-opted and controlled by the 1% using their money so that they can steer society, use their influence on society's "democracy" to get what they want. It's sick.
I would prefer we move past this ridiculous era in human history. I wish people would see the construction of L / R politics has been used to control us these past 125 years and is not fit for service anymore but I honestly think its past the point of no return and we're in a death spiral. I think we're living through our "Great Filter" right now