2008 Acura TL -Not starting

things need to be tested before replacing them , but if you want to keep buying random parts go for it , You could have bought test equipment instead of parts you didn't need , now you're still at square one .

Make sure you have fuel pressure at the fuel rail, test each cylinder for spark (can be done by removing spark plug and reconnecting wire then grounding it to the intake manifold and watch for spark while someone hits the key. Verify compression and timing

Make sure your battery cables are tight not only at the battery but where they connect to the alternator, fuse box, and chassis grounds. Check all fuses and relays. I have solved this same type of issue many times by simply tightening battery connections. Often, you will have power until the key is turned to start the engine and the high amp load of the starter causes the loose connection to arc and break the circuit. It's very important to ensure that all of your ground straps are in good condition and making good contact at both ends. Start there and let me know what you find out.