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It will be fine to leave them out. The mint is best kept in a container, as they will quickly take over any area you plant it in very fast. Basil is treated as an annual here, and you will more than likely have to replant each season. There are ways to keep it alive for longer, but it is much easier to replant each season. Parsley is the same way. Either way, the mint will be the one to survive. All mints are unusually invasive. To keep the basil and parsley for longer you can bring them inside, and continue to care for them. Remove any flower spikes that emerge.

A lot of times, this is due to a pH issue. This can be offset by adding dolomitic lime to the soil. This will keep the pH from swinging too high, which is often the case.

Here is an article that will help: https://www.gardeningknowhow.com/edible/herbs/basil/information-on-how-to-grow-basil-indoors.htm

The most likely culprit would be overwatering. In container, these tend to like a few days of completely dry soil in between waterings.

The next likely solution is that the soil is the problem. If you are certain that it is receiving the correct amount of watering, then your soil may, either, be contaminated or too thick to drain properly.

You can add a little wettable sulfur, and dolomitic lime to the soil to help keep it conditioned in the container.

Here is a collection of articles that will help: https://www.gardeningknowhow.com/edible/herbs/basil/

It appears to be something called soft rot. The bumbs will eventually turn black and rot off, which will kill the plant. This will likely kill the plant, but you can try wettable sulfur in the soil. It will be easier to restart the basil, though.

Just make sure to watch your watering, as this is the usual cause. Only water when the soil is pretty dry.

This article will give you more information on growing basil: https://www.gardeningknowhow.com/edible/herbs/basil/information-on-how-to-grow-basil-indoors.htm

Flowering and going to seed does make basil leaves bitter, as explained here:
https://www.gardeningknowhow.com/edible/herbs/basil/bitter-tasting-basil.htm

Trimming your basil plants back to above the bottom two sets of leaves may make your basil less bitter when it regrows. It's not guaranteed, but it's worth a try. Avoiding overwatering and underwatering can also improve the flavor of your basil.

There are white soft salt like crystals formed in the soil of my basil plant. i want to know all about these white soil crystals and how to remove them