For a young person about to work on a farm...
1. Be punctual, and if you are going to be a "no show", communicate this as soon as possible.
2. Be observant, particularly with regards to livestock. Are they happy, or marching up and down the fence suggesting they might be thirsty. Keep an eye on the troughs. Do they have enough feed? Are the fences OK, or has a limb fallen on a fence which could lead to livestock getting out? Learn the paddock names and the Road names so you know where you are in an emergency.
3. For a young person likely to inherit the farm, make sure you are on top of the finances and financial management. Know what the structure is, what is the will, what is the succession plan? Spend your capital wisely, conserve it as much as possible, and where possible use contractors