Long story short

1. following the European elections, Macron used his constitutional right to call for new parliamentary elections, a risky moved that hasn't been used since 1997.
2. European elections led to 3 similar sized block : A left wing union from with communists, green and social-democrats, a Center-right pro Macron block, and a far-right block
3. Macron appointed former EU brexit negotiator Barnier as a prime minister, he is from a right wing party who's done a pretty low score at the election, and he bought a government with centre-right liberals and some more conservative to show the far-right that it could have been worse.
4. The parliament struggled to vote a budget, so Barnier used the trust me bro technique, a constitutional trick which allows you to bypass a parliament vote on a law but triggers a confidence vote.
5. The Far-right decided that the current wasn't right wing enough and vote the non confidence with the left-wing, meaning that the budget is rejected and the prime minister has to resign

Direct consequences is that France has no budget for 2025 (I assume it means that they'll re-use the 2024 budget until they vote something) and that Macron will have to appoint a new PM. With some luck French politicians will start behaving like in any democratic nation and build a coalition over a given coaltion contract rather than blaming each other on the TV