The words opposite and across from mean that something is located at the other side of something.

The bank is opposite the post office. or The bank is across from the post office.

Henry sat opposite me at the table. or Henry sat across from me at the table.

The expression in front of simply means that one thing is closer to a point of reference (the "front" of an area, or the point of view of the person looking).

I stood in front of the bank.

He sat in front of me in the classroom.

The word before can be used for location/position, but it is somewhat rare and more formal. Instead, before is typically used for time or for position in a sequence:

We need to pack our bags before leaving for the airport.

The letter i comes before the letter e in the word "friend." or position in a sequence

Benefits of Turnips

Capillary Structure

Turnips are rich in flavonoids, which are good for maintaining the structure of capillaries. Turnips, members of the cruciferous family of vegetables, along with broccoli, collards, kale and Brussels sprouts, grow in temperate climates throughout the world. Most commonly grown for their white bulbous roots, turnip leaves and sprouts are also edible and highly nutritious. Turnips are a valuable addition to your healthy diet and provide a wide range of health benefits.