explain these please, need extra notes. Thank you.

a. Extensive detail on perpetual and periodic inventory systems i. Similarities and differences between systems ii. Costs and benefits of systems iii. How journal entries work iv. How beginning inventory, purchases, goods available for sell, COGS, and ending inventory are calculated b. What goods should be included in inventory? i. Consignment ii. Goods in transit 1. How are freight in versus freight out costs treated? iii. Sales returns c. Treatment of purchase returns and discounts (gross and net method) d. FIFO, LIFO, and average cost i. How do they work? 1. Periodic method 2. Perpetual method ii. Which method produces highest/lowest COGS (ending inventory) 1. In periods of rising prices? 2. In periods of falling prices? e. Special topics in LIFO i. What happens when previous year's LIFO layers are liquidated? ii. LIFO inventory pools iii. Dollar value LIFO f. Ratios i. Gross profit ii. Inventory turnover