Noted.
Which directions lead into combos best?
probably down throw
maybe forward throw at lower percents
if they're really heavy/fast falling then do up throw
if you don't want to deal with the tippers use lucina, though marth is stronger if you hit with the tip
that's it, if you're marth just keep a distance between you and the enemy so you can land more hits with the tip
you should probably try doing "tippers" with lucina anyway, for three reasons:
1. practice zoning
2. prep yourself to play marth (marth is the better character objectively, lucina isnt much different or better besides her sword's sweetspots)
3. swag