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This is fairly common and comes from a lack of calcium in the soil. Remove and discard the damaged fruit. I also use a spray of espom salts and water (1 teaspoon epsom salts to 1 quart of warm water and mix throughly) Soak the plants and the soil. The magnesium in the salts, helps the plant set fruit and it also helps the plant absorb additional calcium. Since those 2 minerals usually work in concert with each other.

This article should help also:

https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm

Tomatoes are easy to freeze. Wash them well, put them on a cookie sheet, freeze and bag them up. When thawed they get a little "mushy", but if you treat them like a "boil in bag", thaw in hot water. You will be able to squeeze and most of the tomato pulp will separate, leaving seeds etc behind. Makes doing homemade sauce, juice, catsup, etc super easy! Freezing is also a great way to handle the extra you may be dealing with later as the tomatoes ripen. I normally can a bunch and by that time I'm tired of looking at them, so just pop them in the freezer and use them during the winter. So yummy, and the smell is wonderful!! Good luck!

Could be late blight. Google the term and see if that's what could be. If it is, don't let the tomato plants touch one another or touch the peppers. It's touch, and if they touch it spreads right along. It wiped out our tomatoes and peppers right in a row last year.

The following articles should be of some help to you: https://www.gardeningknowhow.com/edible/vegetables/tomato/best-way-stake-tomatoes.htm
https://www.gardeningknowhow.com/edible/vegetables/tomato/should-you-prune-tomato-plants.htm

This is blossom end rot. This article will help:
https://www.gardeningknowhow.com/edible/vegetables/tomato/tomato-blossom-rot.htm

This can happen if they are left on the vine too long. You may also have had a small bit of insect damage to the skin or cracking from fast growth that allowed disease to get into the fruit.