Weather is the short term change in the atmosphere that happens from day to day, and climate is the long term change in the atmosphere and precipitation over a long amount of time.
High pressure systems bring calm and sunny weather without precipitation and then Low pressure systems bring cool and rainy weather.
Cold and Warm fronts is when air of a specific temperature is blown into a area in one big gust.
The sun warms the air and triggers convection currents that blow air around because of sea levels and then make warm fronts and or cold fronts happen because of the uneven heating the sun does.
Warm airs sometimes interact with the sea in a way when the ocean is warm and the air is warm and then when the temperature change to rapidly and triggers strong convection currents that move the water into a hurricane or tropical storm.