Some online health tips can be considered / can be thought of as / can be regarded as rubbish. (voidaan pitää)

But obviously, some diseases would be cured with fairly simple methods. (parannettaisiin)

Perhaps some major epidemics could have been stopped / could've been stopped with them. (olisi voitu pysäyttää)

Firstly, hands must be washed with both water and soap to prevent catching a cold. (täytyy pestä)

Tension headache can be relieved by rubbing peppermint oil onto one’s temples. (voidaan lievittää (relieve))

Apparently, high blood pressure can be lowered by eating bananas, for example. (voidaan alentaa)

To avoid infection, some honey should be poured on a cut before covering it with a bandage. (pitäisi kaataa)

I wonder if these tips will ever be used. (tullaan koskaan käyttämään)