The conjunction 总之
We use 总之 to summarize the meaning of a previous statement.
We use the conjunction 总之 
in two cases:
1) at the beginning of a sentence to make the conclusion to all that had been said before.
in two cases:
1) at the beginning of a sentence to make the conclusion to all that had been said before. Pay attention
We should put 总之 at the beginning of a sentence, and insert a comma before stating the rest of the sentence.
Examples
总之，无论天气如何变化，我们的出发时间都不会改变
In short, no matter how the weather changes, our departure time will not change
zǒngzhī, wúlùn tiānqì rúhé biànhuà, wǒmen de chūfā shíjiān dōu bú huì gǎibiàn
总之，我们必须注意我们孩子们的教育
In short, we must pay attention to the education of our children
zǒngzhī, wǒmen bìxū zhùyì wǒmen háizimen de jiàoyù
2) after the enumeration of homogeneous members of a sentence in order to summarize them.
Examples
大大学、中中小学，总之，所有学校都应该提高教育质量
Universities, schools and colleges — or in other words all schools — should improve the quality of their education
dàxué, zhōng xiǎoxué, zǒngzhī, suǒyǒu xuéxiào dōu yīnggāi tígāo jiàoyù zhìliàng
他经常迟到，工作也不负责任，总之，您必须免职他
He is often late and irresponsible. In short, you should fire him
tā jīngcháng chídào, gōngzuò yě bú fùzérèn, zǒngzhī, nín bìxū miǎnzhí tā