Same here, no expert and learning all the time, I make sure the bottom leaves are gone so no splash back or none touching the soil. this year I have thinned the leaves more than I normally would and I'm getting a good crop, I'm trying to balance what I see my neighbour doing (no leaves and plenty tomatoes) with leaving leaves and having plenty tomatoes. I guess it's like eveything in life, a fine balance, leave enough leaves for the plant to be healthy but not enough to take away from the fruit.