Are you learning British or American English? American English: on weekend/ on the weekend British English: at weekends/ at the weekend

Difficult! Prepositions are sooooooooo nitpicky. In can also apply. On weekends I go to the market. Note without a particle it is weekendS. But: I met my daughter AT the weekend get-together (weekend here serves as an adjective). IN the weekend meeting we spoke about new business. I met my girlfriend ON a weekend walk. You really need a particle in your question. If weekend is a noun you say 'on the weekend', But remember there is also This weekend, Next weekend without any preposition.

on weekends is habitual - meaning most/every weekend; 'on sunny weekends going to the beach is lovely'; but you can also say 'on a sunny weekend, going to the beach is great'

both are correct, people in U.K usually say that 'at weekend.' But in U.S we prefer to say 'on weekend.'

can pliz explain more why on weekends. precise answer.thanks in advance