I think that it is clear but when you use like a pronom COD and COI as for me it so difficult le difference entre COD y COI ca va bien, mais ... it make me confuse when i try to put like a pronom

Je ne sais pas le difference entre COD et COI? aide !!!

je voluodrais étudier et practice francais well i just try to learn and meet people who wants to speak with me