Here are some common ways to use "however":
1. To introduce a contrast:
* I wanted to go to the party, however, I was too tired. (The contrast is between wanting to go and being too tired)
* The weather was terrible. However, we still had a great time. (The contrast is between the bad weather and the enjoyable experience)
2. To introduce a qualification or exception:
* I love to eat vegetables, however, I can't stand broccoli. (The exception is broccoli)
* The movie was well-acted. However, the plot was weak. (The qualification is about the plot)
3. To show a different point of view:
* Some people believe that climate change is a hoax. However, scientists have overwhelming evidence that it's real. (The contrasting point of view is about the existence of climate change)
Punctuation with "however":
* "However" is usually set off by a comma.
* I wanted to go to the party, however, I was too tired.
* If "however" comes at the beginning of a sentence, it needs a comma after it.
* However, I still had a great time.
* "However" can also be used in the middle of a sentence, in which case it's usually surrounded by commas.
* The movie was well-acted, however, the plot was weak.
Important Note: "However" is a formal word. It is used in formal writing, speech, and when you want to express a strong contrast.