If youre looking to get better at mastering these two concepts, the best advice I can offer is to play some games of Commander

Sythis, Harvests Hand Sythis, Harvest's Hand | Illustration by Ryan Yee Commander (1) Creature (29) Yavimaya Enchantress Transcendent Envoy Sun Titan Starnheim Courser Starfield Mystic Siona, Captain of the Pyleas Setessan Champion Satyr Enchanter Renata, Called to the Hunt Nyx-Fleece Ram Nessian Wanderer Monk Idealist Mesa Enchantress Llanowar Elves Herald of the Pantheon Heliod's Pilgrim Fyndhorn Elves Elvish Mystic Eidolon of Blossoms Destiny Spinner Daxos, Blessed by the Sun Celestial Ancient Avacyn's Pilgrim Auramancer Archon of Sun's Grace Arbor Elf Arasta of the Endless Web Alseid of Life's Bounty Ajani's Chosen Instant (1) Sorcery (8) Winds of Rath Rampant Growth Regrowth Plea for Guidance Open the Armory Kruphix's Insight Cultivate Approach of the Second Sun Enchantment (24) Wild Growth Whip Silk Wolfwillow Haven Squirrel Nest Spirit Mantle Solitary Confinement Sigil of the Empty Throne Seal of Primordium Rancor Overgrowth Omen of the Hunt Mana Bloom Kenrith's Transformation Ground Seal Font of Fertility Fertile Ground Felidar Retreat Ethereal Armor Enchantress's Presence Elspeth Conquers Death Darksteel Mutation Banishing Light Abundant Growth Abundance Artifact (2) Land (35) Tranquil Thicket Temple of Plenty Terramorphic Expanse Sungrass Prairie Selesnya Sanctuary Secluded Steppe Plains x10 Myriad Landscape Krosan Verge Graypelt Refuge Forest x11 Exotic Orchard Evolving Wilds Command Tower Blossoming Sands Ash Barrens Sythis, Harvest's Hand is a very beginner-friendly Selesnya commander

It has been 22 years, after all
Today, rare cards sell for huge sums at auctions
That's why cards like Decimate are so strong for Gruul, decks, since Decimate can outright destroy permanents of many different types, no burn or fighting needed
Then the spells controller may choose new targets for it