I too love containers. Window boxes under all my windows on the house and garage, hanging baskets and planters.
Tips:
Buy a hanging basket (10 or 12 inch) and repot it into a deeper and wider basket. When hanging baskets are available in stores, they a big, beautiful and often maxed out for root space to continue growing. Boughten planters are often deep enough, but slip it out and have a look at the root situation. Healthy roots mean healthy plants. You will never buy all those plants cheaper, separately. + the plants chosen by the grower are chosen with similar growth habits and the basket stays uniform. With short seasons, starting big is a bonus
Use new potting soil and add slow release fertilizer. With the additional root space, your baskets will be easier to maintain for moisture levels. I like Premier Pro-MixBX soil mix and SmartKote fertilizer
Line all fibre/wire baskets with a heavy plastic and punch some drain holes. The wind dries out terra cotta pots and fibre lined baskets very quickly in dry climates.
Our tap water is frigid and also high pH (about 8.3 mid summer). Most plants will have problems with uptake of nutrients with cold water/soil and high pH. Rain water is best, but if I use tap water, I water with warm water even though it is treated drinking water.
Drain holes are important. Try to keep the soil evenly moist, not saturated or parched. I also use water soluble fertilizer every few weeks in addition to the slow release mid to end of season. Containers deplete of nutrients very quickly. I use an Ultra-Bloom water soluble late July to September
Choose the plants for one basket that fit the location: all Sun loving or all dappled shade etc.
Have a few mono-planted pots/baskets. Too many mixed coloured baskets will look a bit too busy. Like your flower beds, clumps of colours creates flow and also ties the entire garden together.
I find tomatoes do better in-ground than in a container.
I grow many things in containers. Peppers, Herbs, Roses and all kinds annuals, including vines. It's fun to change the colour scheme each year. Here's a couple before & after. I water my baskets twice a week or each day when the temperatures are above 24ºC/75ºF and the baskets are located in full sun
And in this photo (last summer) there is a heart shape which was a nice surprise
And here is a photo taken Sept 17. Containers & hanging baskets can last for the entire season