How To Not Use However

You can use but here instead because it is a conjunction or joining word.
How to not use however. None of the other uses of however which are relatively rare requires a comma. My house however is big. However i made a promise to go with her. I have a lot of homework tonight. We do not use however to join two sentences.
The forecast is bad however it is possible that the weather could get better. Some usage guides will recommend against placing it there when the intended meaning is nonetheless but will allow it for other senses of however but a considerable number of prominent and not so prominent writers utilize just this sense of however in the initial position. It is followed by a comma. This is how to use however in formal writing such as business correspondence emails etc. You can indeed use however in the middle of a sentence.
However often begins a sentence. I m going to buy a car. However contrasts a sentence against the preceding sentence. However has a similar meaning to nevertheless or despite this. But it is wrong to use however between two parts of a sentence that make sense by themselves.
However it was very long. Listen to all all sentences with pause example sentences. When however is a relative adverb it is used to express a lack of limits. It can be used to start a sentence or inserted after a comma in a dependent clause. In fact when i was at school a couple of centuries ago i was taught that however when it meant nevertheless should never be used as the first word of a sentence but it can when it means to whatever extent.
My car is small. The other adverbial uses are as a synonym for to whatever degree or extent as in i have been aware of that for however many years and as an intensifier equivalent to the expression how in the world as in however did you know i was going to say that. However i ll go to support you. I like that sweater. However it only comes in one color.