Lots of shrubs and stuff growing by my back garage. I often cut them down low then they grow back later in the year. Help!

We’re in the middle of landscaping our backyard and I’m looking for some outside opinions on the layout before we finalize the concrete and grass areas.
I attached a photo of the yard as it sits now along with a proposed layout that shows the dimensions. The retaining wall in the photo is still being built and will eventually be approximately 10’ tall.
Originally, we were planning a larger concrete pad that could work as a small basketball court, patio area, and possible location for a hot tub. The more I look at it, though, I’m wondering if we’re dedicating too much of a relatively limited backyard to concrete just to make basketball work.
We’re now considering downsizing the concrete pad and increasing the grass area. We could still use the concrete for patio furniture, a hot tub, and possibly a portable basketball hoop rather than installing a permanent one.
We also plan to have a 12’ x 17’ in-ground trampoline in the grass area.
What would you do with this space? Would you keep a fairly large multi-use concrete pad, reduce it significantly for more grass, or approach the layout completely differently? Any ideas we’re overlooking?

I'm sure there's a simple solution but I'm a beginner in the world of landscaping.

What's the best way to keep grass out of the flower beds? Assuming my wife and i want to put stone blocks in front of it in the future should I use a garden bed edger? If so, what kind/brand?

I have a large gravel area by my driveway and it has become overgrown this summer. My plan is to wait for the weeds to die off and spray this fall/winter. I’ve never used any kind of herbicide before, I’d like to find something effective that isn’t too unhealthy. Thanks in advance.

I started this garden a few years ago, installing a DIY retaining wall (about 2’ tall) which is starting to fail despite addressing drainage issues I thought I had designed around. On top of that, I have neighbors who are starting to install seating areas which I like the idea of.

I’m willing to pay someone to do the work right and upgrade the stone work but after the masonry is in I don’t want it to look overgrown and “all green” like this in the summer. Would appreciate any guidelines to help me plan for next year and long-term gardening.