Most rear baskets attach to any standard rear luggage rack.
Front baskets usually come with a sub-standard fitting arrangement. I fixed my friends hook-on front basket by using a basket bracket made by
Rixen and Kaul, it just bolted through the grid. This was a non-removable version, but they also make ones with a very secure quick release if you need to carry your basket.
The R&K fitting positions the basket further from the bars for better hand clearance and you can position it for optimum angle so stuff doesn't bounce out.
Most utility riders use 2 large rear panniers for groceries. Look for ones with a single large compartment with no organisers, a shape that is profiled to give more heel clearance, ie not square cut, an extendable collar for overfilling with bulky items, a closure that has a flap or roll top, NOT a zipper. An external pocket is useful. You need tough material, good stiffening that is not too heavy and a rack mounting system that is reliable and quick to release. R&K, Arkel, Ortleib all make quality mounts.
You can adapt large bags with correx plastic stiffening and make mounts using extra strong zip ties
Trees don't appreciate bicycle locks on a regular basis, it is much better if you find a piece of street furniture to secure your bike.
Rust on a chain can be eliminated by regular lube. Specialist bike lube with teflon seems to collect less dirt than regular bike oil. Put one small drop on each pivot of the chain, applied to the lower chain run, from the top (ie inside not outside). You relube when it seems to running dry.
Most bike stands bolt to the place just forward of the back wheel; some bolt to a place just forward of the back axle. If the clamp gouges the paintwork you will get surface rust. Apply a small amount of wax (eg furniture wax) but DO NOT WAX THE WHEEL or you will loose all braking. Apply spray wax to a cloth and wipe on. If the rust is on the stand itself, don't worry.