The rules for -ing and -ed for regular verbs are as follows:

1) For regular verbs not covered below, simply add -ing or -ed.

to walk =>  walk+ing => walking

to walk => walk+ed => walked

2) For regular verbs ending in a consonant and a final silent e, drop the final e.

to hate => hate+ing => hat_+ing => hating

to hate => hate+ed => hat_+ed => hated

3) For regular verbs ending in one vowel and one consonant, double the final consonant.

to jog => jog+ing => jogg+ing => jogging

to job => jog+ed => jogg+ed => jogged

Note - Case 3 does not apply to two vowels and one consonant (which is actually case 1)

to bloat => bloating

to bloat => bloated