The best time to trim maples is either late spring to early summer (May, June, July) or late autumn (Nov-Dec), as sap "bleeding" will be more excessive in earlier spring. Pruning young trees is a balance between monitoring the tree for the development of good scaffold branching and removing those which will be problematic in the future versus retaining as many branches as possible because they help fuel the tree's establishment and maturation. Low branches are thought to be important for increasing a young tree's caliper (trunk diameter) more quickly, which not only stores resources but also helps to stabilize the trunk, so they shouldn't be removed too early. If the tree will serve as a screen to block a view, retaining low limbs would be desirable. Plus, if the tree doesn't need ground clearance for vehicular or pedestrian traffic close to the trunk, you won't necessarily need to remove low limbs for accessibility. Complicating the decision over what to prune in any area of the canopy is the fact that some branches on young trees are also not permanent, in that older trees typically don't retain all of the limbs they had as saplings, as they had since been shed by an older tree.

Don't remove more than about a quarter of a tree's canopy any one year, and try to prune no more often (and only as needed) every other year. The International Society of Arboriculture, the organization that certifies arborists, produced a quick guide to pruning young trees: https://www.treesaregood.org/Portals/0/TreesAreGood_Pruning%20Young%20Trees_0621.pdf

Although this is a very young tree, you may want to consult an arborist regarding pruning; some arborists consult independently and others are members of a tree-care company. What appears to be a shared attachment point for several major branches is normally not a desirable trait, but the removal of select branches could deprive the tree of a substantial portion of its canopy. Normally, the leader should be the dominant stem in terms of thickness and height, but we aren't sure if the side branch currently being the tallest by a few inches at this point is anything to worry about. That said, overall, we can't see as much detail from a photo as an in-person assessment may reveal.

If the Arbor Day Foundation didn't include the botanical name with the tree -- the surest way to ID it -- then we would guess this is either a Red Maple (Acer rubrum) or Sugar Maple (Acer saccharum). It will be easier to ID once the foliage has emerged for the summer, or when it's old enough to produce seeds. Hopefully it's a Red Maple as they are more suitable for a wider range of conditions; Sugar Maple can struggle in our summer heat because it prefers more northern or higher-latitude habitats. There are several Red-Silver Maple hybrids (Acer x freemanii) on the market but we don't know if these are part of the ADF's tree inventory.

Miri