1. Explain it simply
无论 (wúlùn) means 'regardless' or 'no matter'; it is the more formal partner of 不管.
The first clause needs a question word (谁, 什么, 哪里, 多 + adjective) or a choice with 还是.
都 (or 也) sits before the verb of the second clause: 无论…，(subject) 都….
无论 heads the first clause and 都 stays before the verb - never stack the two together.
2. Show examples
无论工作多忙，他都会锻炼身体。
Wúlùn gōngzuò duō máng, tā dōu huì duànliàn shēntǐ.
No matter how busy work is, he always exercises.
都 marks the steady result
无论你说什么，我都相信你。
Wúlùn nǐ shuō shénme, wǒ dōu xiāngxìn nǐ.
No matter what you say, I believe you.
什么 covers everything
无论去哪里，他都带着相机。
Wúlùn qù nǎlǐ, tā dōu dàizhe xiàngjī.
No matter where he goes, he takes his camera.
哪里 covers every place
3. Share a tip
无论 is more formal than 不管; both keep 都 in the second clause, so 无论…都 and 不管…都 work the same way.